Must admit that my only experience with Seagate is to hit them with hammers, but that's what you get when working with electronics recycling. Quite fond of them, as they were among the easier to dent, if I remember correctly. (It's been a couple of years since I quit.)
I've had a LaCie something brand for around two years now, it's been kicked around, transported in bags on planes and generally been subjected to more casual abuse than I'm comfortable with and it's still working perfectly. Of course, I've happened to take apart the model of LaCie I have, and damn, that's a lot of steel wrapped around the thing. Also have a WD I got maybe half a year after the laCie, which has been through most of the same things. No problems with it, either. Got a new LaCie of a different make a couple of months ago, and it's now going through a lot of the same trauma as the other two, so it'll be interesting to see how that works out.