i used h-sphere for a while with another reseller program, and found the interfaces truly unattractive, poorly designed, and difficult from a usability standpoint. couldn't stand it.
but, have decided to try resellerspanel.com - so far, it's great because it includes support and billing... so i can focus on marketing. and the interface is simple and easy.
Glad to hear you found something that worked for you. H-Sphere can be bit complex because it gives you so much freedom as a reseller. Also they just released 2.4 with a great new interface.
Take care,
Jason Dickman
954.792.9254
jason@ourinternet.us
www.ourinternet.us