Jeff,
Lack of doc was also a worry for me but all the doc that the big vendors put out doesn't really mean that much other than head curve. It would be nice for Hybrid to put more info out. Their pumps are custom designed by Hybrid and made under contract by a large pump company. Their drives range from off the shelf units used commercially to custom designed units built by a drive company specifically for Hybrid (similar to Pentair - an external drive company custom built their drive for Pentair - at least that's what I read).
I have to admit that even the doc they give out does not keep up with their product development. BTW, Hybrid has done a couple of installs in NorCal so if you are interested, you can ask them. Being a small company, their product development cycle is pretty short. They are developing new drives with new capabilities and making improvements to their pumps. When Pentair came out with their Intelliflo, they introduced new models as they made improvements (vs, vs+svrs, vf - maybe they even still have the original model). Hybrid just keeps calling their latest product the same model and just gives you the latest updated model. My X2 is different from Bruce's and different from the picture on the website and owner's manual.
With either the VF or X2, you may need to change the flow for the vac so it is operating at optimum efficiency. Go with the pump that works for you. I was swayed by having local support if I needed it. Pentair has people nationwide that can service their equipment - you just have to find one that works for your benefit.
