So far, Waves has been great for me. I had an issue with my plugs not showing in X3. It was all my fault because I was trying to do stupid things at the time. Waves sent me a program that allowed them to take over my DAW and fix everything for me. Fast and efficient. As for WUP, well, most of my Waves stuff is old and will never be updated (L1 for instance). The J37 is my only new Waves product and the only one that I'll worry about.
Try the J37 on acoustic guitar using its delay. Very cool.