Interesting development. Especially late in the game.
I think that more a less MechBunny and Smart Tube Pro have zipped up the tube site cms market place. At least for those who are serious about a tube site and the higher end clients.
This is not to say yours is shit by any means. I wish you well on cracking the market. it sounds like you have invested a lot of time and effort in the development phase if you have private clients.