With all that said, here's the email/warning about the stuttering issue:

"I saw the comment (regarding raves from readers w/OCZ Vertex drives) ... and wanted to let you know that there is a major caveat that those users probably didn't run into at their first test(s). The Vertex series has a major problem with regard to stutter in Macs for some unknown reason (this may be due to differences between Windows and OS X I/O implementations).
(The "stuttering" comment reminded me of the posts here last fall from Seagate 1.5TB owners (w/early firmware - the later firmware update fixed that and the drive failure fiasco that affected many models) - some didn't notice the problem at first but when testing movie playback found there was a stuttering problem (I/O pausing/stopping - console showed messages related to jnl). Before the firmware updates, one workaround for the stuttering was disabling journaling.-Mike)

While the Vertex series has somewhat higher top end read/write performance ratings, the Summit series does not appear to have the stutter issue (we're talking 3-5 second pauses locking up the computer completely kind of stutter) that the Vertex series has. One of the things helping the Summit series is the very large 128 MB cache vs. the 64 MB cache of the Vertex series (the earliest Vertex and the Solid series had no cache as far as I know).
(FYI - here's a Summit Series 250GB SSD review at a PC site. For those that missed earlier articles links covering issues (and concerns) on SSD drives (including stuttering problems with early Vertex drives (addressed by later changes/firmware), see reference links below.-Mike)
You'll find that the OCZ support forums are chock full of Mac users reporting stutter with the Vertex series SSDs. This does not appear to be the case with the Summit SSDs. (Both vertex and summit are MLCs, but Vertex has an Indilinx controller (w/64MB cache), the Summit a Samsung (w/128MB cache).) I'll be damned if I know why the Vertex SSDs have the stutter problem, considering that even the "paltry" 64 MB cache is quite large considering that a majority of SSDs out there have *no* cache whatsoever. The Vertex Extreme series may or may not suffer the same stutter issues - those are essentially the cheap man's equivalant to the Intel X-25E series (enhanced SLC NAND).
Oh, and don't let the Summit's lower speed ratings fool you: I get nearly a 500% speedup loading World of Warcraft and all its addons vs. my WD 1TB GreenPower HD, and that's a crapton of small 4k files there, which is where SSDs typically suffer the most. :)
I just wish I didn't have to buy an IcyDock converter for each SSD I want just to mount them properly in my Mac Pro.
- Eric"

I'm trying to get a Vertex SSD for my own tests (in a Mac Pro, I don't have a Mac notebook currently). In the meantime if any Mac/OS X users of a Vertex SSD have seen this problem, let me know the details (Mac model, your SSD drive firmware version, etc.)
BTW - I'm now reading through a long thread in OCZ's forums on problems. (From the first email I thought this was just another case of stuttering (pausing/IO stoppages) that's most noticeable on video playback - but those affected are reporting much worse/general use problems and freezes.) Most posts on problems I've seen so far there were from notebook users and several had new MacBook Pros. I'm beginning to wonder if this is just another case of problems with the new (mid-2009) MacBook Pros regarding EFI firmware v1.7. That's been a problem reported with -some- other (non-SSD) drives as well (freezes, BBOD, etc.). Several pages of posts in that thread to read still (not sure I'll get to them all, it's 4AM now). (Just saw one post saying he also had a couple freezes w/EFI 1.6 (logic board swap), not just the 1.7 EFI firmware)

FYI - I had some replies to this post that mentioned early SSD/Vertex articles from earlier this year. I'd linked to those articles in the past but here's a sample of them again. (There are later updates to drives/firmware since these articles were posted)

• The SSD Anthology: Understanding SSDs and New Drives from OCZ (March 18th, 2009 Anandtech article - 31 pages, covers stuttering, early model Vertex issues, etc)
• The SSD Update: Vertex Gets Faster, New Indilinx Drives and Intel/MacBook Problems Resolved (Anandtech - March 30th, 2009 - there's even later vertex updates since then)
  
  (And a repeat of some early posted links on Intel SSDs/Other long-term concerns)
• Long-term performance analysis of Intel Mainstream SSDs (PC Perspective - Feb 13th, 2009)
• Intel Responds to Fragmentation with New X25-M Firmware (PC Perspective - April 13th, 2009)

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If you've upgraded the CPU on your Mac, send a review with your experience (performance/stability/installation, etc.), Mac Model/Upgrade brand info and overall rating (1= worst to 10=best). If you can, please run some tests with the original CPU vs the upgrade (for example time some tests with your favorite app, game, etc. - see full reviews here for example tests with common apps/games/benchmarks.)

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