I have had vps from over two dozen providers & inception is definitely among the best. I am surprised to not see @AnthonySmith 's service among the top three, I guess they need to conduct a better pr campaign.
I have the xen pv 2gb plan & the service has been top class except the times around the offers when everyone is testing the disk(very rare).
There is some strictness with regards to the IP allotment but its pretty justified keeping in view the shortages.
The only downtime I have had was a DoS attack targeted at inception or some other vps which lasted for 20 minutes or so. Apart from that it has been smooth sailing.
The hardware is awesome though several other providers can offer you the same specs but what sets Inception apart from the rest is 'professionalism'. I wish the best to Inception because they have got everything to be on the top.