I use an Ekich bobbin and IMO, it's the best one out there ( I have not used the Rite though). I didn't think it would really make much of a difference, but after tying with one for a week, I couldn't go back to using a standard bobbin. The Nor-vise bobbins are great as well, but the big drawback for me was the spools. Because you need to wind the thread to the spools, you lose out on any time saving. the Ekich accepts standard spools like UNI, Danville, Gudebrod and Bennechi (with a small notch cut). The tension is great, and I can even use the UNI Caenis (20 denier) with it. The only drawback I've found with it is the length of thread you can use before needing to reset the tension spring. You can use 24 inches, which is enough for most trout flies I tie, but for the salmon and steelhead flies I tie, I usually need to reset it once, but even that, is pretty simple and can be done one handed while you tie.
I would suggest getting a hold of someone with any of the bobbins interested in and giving them a try. If you come to the Fusion show in the new year, there should be a couple people with the bobbins to look over and see how they work.