Sorry, I thought you said you had the Vertex 2E (SF-1500) - are these other drives you didn't mention? And i'm agreeing - 4 drives aren't enough to draw conclusions
It's quite a few less than the sample of, say, this report yeah?
Frankly, i'm dubious about anyone claiming that SF-2281 is in any way 'reliable' given the heap of evidence to the contrary (even in this thread).
..but they'd probably not deny they had done. To my knowledge the F series of drives have had a fair few faults in early 2TB configuration, the 1TBs were pretty rock solid and they're now not even made by Samsung (and thus reliability seems to be in question once more). They've also needed firmware updates to cope with SATA 3 ports over the years too (the wonderful mechanical clanking noise from one PC informed me right away that there was a problem).