I know this is a very late response to this question, but given the lack of information about ACSite.net, I thought I would post.
I have been using them for a little over 6 months now and during that time their service has been outstanding. The few times that I have needed to contact support their responses have been extremely fast and helpful. They have even turned on features for me - all this on a shared host!
The server response times have always been outstanding. I host one open source project on the server. When the project admininstrator first started testing the new server he was amazed at how responsive it was.
I would highly recommend ACSite to someone looking to setup multiple domains but who doesn't have the inclination or need to run their own dedicated server. They do not currently offer VPS and/or dedicated, but if what you are looking for is a virtual shared server they are top notch.
Travis Swicegood
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From the Crossroads
Domain51 Productions