I find USB 3.0 just about as flaky as USB 1.0 was. A lot to the problems I found are related to the connectors The A type connectors have very short connectors for the USB 3 connections. My WD passport 2 GB has the Mini connectors and has been flawless for 6 months or so. My NB has issues with the left side ports there on a daughterboard. I miss not having a eSATA connection but also realize that USB 3 and 3.1 are going to be far better.
Strange . . . My new HP desktop has USB 3.0 and I have no problems whatsoever with it. I've had my Toshiba external 1 TB drive for about a year and have never had a disconnect with it, either while using it with USB 2.0 or 3.0. I've had the WD for several months and haven't experienced any disconnects with it either.
Since it seems USB 3.1 won't be backward compatible, I guess it'll be awhile before I worry about that one.