If you find a good Windows based alternative let me know.
We have been using it for a while, it is good but we want to upgrade to the new version, however it is no good for us in its current state. If you dont want to offer resellers it may be ok but there is no quota system on it. it is plan based and the resellers cant even create their own plans, they have to use the hosts. In version 1.4 wich we use, you can allocate amounts of space, domains and email, etc but you cant do this in the new version.
Read the forums at hostingcontroller.com, their users are quite honest and blunt about the product.
www.38h.com - Windows Hosting, Resellers and Dedicated
www.iistalk.net Windows only forum.