Personally I'm not even phased in the slightest about using the plain bearing, the use of quality parts (garrett core) and the fact it appears to be a well built unit is more than enough peace of mind, also you get a 1 year back to base warrenty.
The real test of how it performs on the car is proven to me day in day out, and I'm extremely happy with it (even though the gf isn't happy with the rapid acceleration)
There has been lots of mention about the bearing not tolerating times of no oil pressure etc etc, but I think even in the example SK gave of the car that stalled and baked the bearing this would have happened with a BB turbo as well, the car wasn't restarted for quite some time and would most probably have damaged a BB core equally. The cost of sorting a plain bearing out though is a lot less though.
If you look after the supporting systems and in this case make sure the oil flow is increased, I can't forsee too many issues with it, unless you thrash the car too hard and stall it lots.
With 7000kms a year I'd say you'll be more than happy as the turbo would remain in as-new condition. I've racked up about 2500kms on it now, runs as good as gold....as expected.