I currently have a VPI Signature 21 (w/FatBoy Gimbal), ADS, and the VPI Peripheral Ring. Really great combo (currently used with a Lyra Kleos SL).
In three years of use, I’ve never used the VTA on the fly. I suppose it’s good to have if one is so inclined.
Just got a new table myself (awaiting arm), but really have enjoyed the VPI quite a bit. If you were to go with a VPI Classic, you may want to look into the Sota Eclipse/VPI setup as a future upgrade. Also would highly recommend the Peripheral ring...pricey but worth it (to me).