You won't know, reliability-wise, until the drives are old (barring large amounts of obvious QC issues). All new drives are built like toys compared to older ones; it's the cost of them all being so cheap.
Go ahead and get it. If you don't have room in your PC, just keep your old one in a closet or something, just in case. I built a PC a couple weeks ago with 2 of the 7241S, and ran them through their paces. Quality DAE was the only area that they were not stellar in. Nobody knows how long it will last for you, but while it does, you won't be disappointed.