Zeta, is very good for what it is. I had one for 9 months. I found it sounds nothing like an upright and responds uniquely. Useful in many situations, but a poor substitute for the wood. I also ran mine through an aguilar preamp smooth out the harsh high end-everything sounds great through this preamp. If your goal is to get some upright chops together you would be doing yourself a disservice. The necks feel great, but there are no shoulders as on a real upright, and the lack of body depth, could adversely affect your stance. Still, I found it very cool on groove gigs, and latin jazz gigs. Great sustain, and a much bigger fundamental than any slab. Not much punch, but interesting things can be done with just stopping the note, as far as moving air...
