The GS112 is a good cabinet and I used it for several years mostly as a solo cab at home. After playing through other cabs the GS112 is not my first choice. It is very mid scooped. If you are playing acoustic bass or upright then it would be a great match. There are many EB players that like it but I think there are better 12" cabs out there for my style (ie. all types of rock, some country, funk).
It was not cost alone that caused me to give Avatar a try. I had been looking at the Epifani 410 and the Berg AE410 and decided to stay with 12's. The Avatar seemed like the best cab for the money. I thought that if I didn't like it I could keep it as a practice cab at our practice place and get something else later. I liked it enough to keep it and would buy another if something happened to it. I wouldn't mind having the Berg AE410 in addition to my 212, but at $1,100 it may be a while before I make that purchase.