I just tried SME8b6 on one and it installed as expected and appears to work fine including the network interface. Now to find a PCEe Ethernet card to add a second interface.....
I used an external USB CD drive because I did not have a spare internal drive to hand.
Time from opening the box to working server : <30mins

These servers are going for a song in the UK, HP are doing a £100 mail in rebate until the end of the month. The best price I could find was £187, needless to say that several of my colleagues were tempted by an '£87' server so we bought 5, now I just have to convince them to try SME server

Regards, Mark Leman