They have some really good stuff. Some of the best in the business in fact. I haven't regretted getting in on some of this stuff, even at the non sale prices I paid for some of it.
I haven't tried this plugin yet, but I do have the STV Classic by Brainworx that I have with my Universal Audio plugins and I can tell you, that one sounds great. I had always used mostly Overlouds Mark Bass in my projects. Now I reach for the UA SVT Classic. So I am hoping this one sounds close to the UA version.