As I understand, my biggest gripes with the Drobo (noise, heat, slow speed, no FireWire) have been fixed in the 2.0 version. However there's one thing that is not mentioned anywhere on the product pages:
… namely the insane amount of time it takes to rebuild the set. I just thought it would be nice to upgrade the last 300 GB drive to 500 GB. It's been doing that for the past 4 hours and by the looks of it I'll be sleeping with earplugs tonight. To be perfectly honest the estimate has dropped to 11 h while writing this, but all of this still looks like Drobo Inc is using 60 GB drives with minimal data to make everything seem smooth in their demo videos. :-/