Easily, quickly and Content

When M4 there is simply nothing to complain about. Each bleating would at a high level.
To widely quoted supposedly "better" alternative (the Samsung 830) I can say,
that the Samsung grade offered me only 5 days of fun, then it was useless
(And permanently in every respect - for a rare compatibility issue)

The M4, however, does exactly what it should.
Compared to a SanDisk (not Extreme) it is felt a little bit faster
(Which will be due to the significantly höhreren IOOPS)

In comparison to SATA II HDD, it is of course noticeably faster though
(Which was also at the Samsung among others so) not because my HDD to SATA II are already very nimble with a "WOW".

With SATA III will markedly improve the safe.

SUPPLEMENT August 2014
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The SDD is still running - now on SATA III, it is also really noticeable WOW_schneller as my HDD's

There was so far no problems. There were only about 3 or 4 cases where the SDD was suddenly no longer recognized (a long time without TRIM in WinXP). Repeated boot / Removing / Installing did not help!

If others have this problem - the solution is quite simple: you drive the PC only the BIOS and high idelt about an hour (more does not hurt) rum.
After a reboot everything was then OK (I suspect this hour idle needs SDD firmware to clean up, if it was really stressed arg)