I've had one for over 6 months and really like it and Windows Home Server too. WHS's non-RAID multi-drive management is very slick. If the drive temps worry you -- they did me -- there are some simple things you can do to increase air flow. (Check out the forum at We Got Served on the H340.)
Some things to note:
- I don't think it supports the newest version of WHS, Vail.
- Remember this is a headless unit, and it's not trivial to get VGA output.
- Acer support is poor (but you probably won't need it).
- WHS doesn't play well with OpenDNS.
- You'll probably want to remove the trial version McAfee AV that comes installed.