I'd say it's very worth it if you play guitar. One thing I wish I had known is Bias FX is kinda the flagship product. Bias Amp is more for tweaking the circuit of the amp. Both are fun. Bias FX is more for tweaking your whole signal chain.
I bought Amp and then FX. Kinda wish I had reversed that order. Mostly I wish it was all one thing.
Somehow I ended up with all three Bias Pedal stuff for free over time. (Distortion, modulation, delay) Bias Pedal is also more for tweaking the pedal circuit. You can use your gear from Bias Amp and Bias Pedal in Bias FX
ETA: I also think they sound pretty damn good. Super fun for a guitar player