They have a forum (abandoned?):
http://my.dnldrm.com/portal/forum/default.asp
You find hands-on feedback there. It doesn't look good though. Users complain about clunky software and lack of sales.
A curiosity:
http://ebook.biz/ belongs to them. Referred to as "the world's premier eBook store," they offer it for sale. It makes you wonder how serious they are about the whole eBooks business.
Another curiosity:
Until recently (2011) they also owned the domain ebook.com. Initially, back in 2002, the domain forwarded to the landing page of their "DeskTop Author" software (that's how old it is - at one point it was on sale @ CompUSA).
Today Tesco is the owner of ebook.com. You can imagine they must have made
quite a few bucks with this domain sale.
They look more like domain auctioneers than anything.