Nvil's standard interface is very dated looking and congested which puts a lot of users off the program immediately despite how good the modeller actually is. To create your own interface for Nvil is a ton of work, believe me I know, I've done it for myself before Rocket came out.

I think that Andrei's is very clean and easy to navigate and makes all the most often tools easy to access. The light and dark gray scheme's are big improvement over the colorful fruity version IMO. Hopefully it will gain wider recognition out there so that money rolls in and development can continue on Rocket/Nvil.

There are plenty of disillusioned hexagon and silo users out there who are looking for an affordable alternative and don't like blender or Wings. I think Rocket might suit them better than Nvil.

Having the MoI and 3D Coat bridges is a big plus also. The MoI bridge does not exist in Nvil only Rocket.