Yes I own a BassMods bass. It's a 7 string. Light it ain't! It weighs 11 pounds 14 ounces! It has a spalted maple top and back over Walnut! It is absolutely BEEOOOTIFUL! Note I also own a Conklin 7 string and it is 12 pounds (!!) and has an ash body. Luckily weight doesn't much bother me. Most of my basses are ash and pretty heavy.
To compare the BassMods to the Conklin, the Conklin is very bright, airy, articulate, and VERY modern. Yeah, I LOVE it for 7 string. To me the Conklin (Bill Dickens model) is the ultimate 7 string bass. The BassMods has a tone and feel that is very much less extreme and much more like your standard run of the mill 6 string bass. And Indeed that was EXACTLY why I bought it! I bought it to have a contrast with the Conklin tone... and also because the look pretty much matches my EMG LTD spalted maple over ash 6 string (also VERY heavy 12 pounds 4 ounces) so it gives me a nice 6 string/7 string spalted pair. Note the EMG LTD also has a very standard 6 string tone too, but both those basses play like butter.
That's about what I know.