I had a Basis 2500 Signature for about 6 years. I bought the Calibrator base and dustcover abou 6 months after I bought the table/arm. I agree with Chayro, it does make moving the table easier, and the cable isolater was nice for my Vector tonearm. However, I can not really say that it made an audible difference. When first inserted I thought that it did, but after much reflection, I think I only heard wishful thinking. I cannot say that the Base made as much of a diffference as my Walker Motor Controller did for around the same price (the Walker was actually cheaper).
Only you can decide whether it's worth it Pops. How much are you expecting for $2K? If your expecting a significant improvement, I'd say forget about it. If your just looking for a cool platform where the pods and motor drop perfectly into place....go for it.