fwiw I've checked in on this drive from time to time. Today's retrospective kicked off by http://www.techpowerup.com/150349/Seaga ... rives.html
1. The 250GB and 320GB models are in short supply or deliberately priced out of contention (no stock of either on Newegg, 320GB version more expensive than 500GB version on Amazon)
2. A number of users have reported problems with the drive
a. http://forums.storagereview.com/index.p ... iscussion/
b. http://forums.seagate.com/t5/Momentus-X ... td-p/99676
c. http://forums.seagate.com/t5/Momentus-X ... d-p/109008
* Uses more power in real world use (shorter battery life) than OEM drive shipped with laptops.
* lockup/freeze/slow response
* odd noises (chirps, beeps)
* large file corruption in Linux
3. Most current public firmware is SD25 but a SD26 has been sent to some users. It seems new drives are being shipped with SD26 firmware but users are stilling having issues.
4. Pricing comparison from Google Products search (with some competitive drive comparisons)
250GB Momentus XT ~$90
320GB Momentus XT ~$100
500GB Momentus XT ~$100
500GB SpinPoint MP4 ~$60
500GB Momentus 7200.4 ~$65 (ST9500420ASG 512 byte sectors)
500GB Scorpio Black ~$65
640GB SpinPoint MP4 ~$75
750GB Momentus 7200.4 ~$85 (ST9750420AS 4096 byte sectors)
750GB Scorpio Black ~$100
3.5 HDs (for the person that might have considered a hybrid HD as a step up vs a traditional drive)
750GB WD Blue ~$55
1TB WD Blue ~$60
1TB Seagate Barracuda 7200RPM ~$70
1.5TB Samsung F4 Ecogreen ~$65
2TB Samsung F4 Ecogreen ~$75
2TB Seagate 5900 RPM ~$90
Samsung 470 64GB ~$100
Crucial M4 64GB ~$110
Intel 320 Series 80GB ~$160
Micron C400 128GB ~$210
Intel 320 series 120GB ~$220
I can't recommend the Momentus XT without reservations. What drive would you recommend in it's place?
Even if you get a Momentus XT you are driven to get the 500GB version based on the (lack of) price difference.
Conclusion / TL;DR
I'd probably look at an SSD for performance or the Samsung Spinpoint M4 drives for lower cost storage in a 2.5" form factor with decent performance instead of getting a hybrid HD. In 3.5" I'd look at the Samsung Ecogreen F4. Maybe the next generation hybrid will be better but until then traditional hard drives are the safe bet and SSDs the option for those with money to spare.
Considering Western Digital and Seagate will have a practical Duopoly in this space within a years time I really hope one or both of them figure out how to make hybrid drives a no brainer. I'd love to stop using traditional HDs. I'd love for OEMs to stop putting traditional drives in prebuilt PCs/laptops/netbooks/etc.