I have a Pro-flex and the new Empire E-Flex. I like the fact that the Pro/Flex8/and Spectra's have a fan option for additional coverage of fogging, but the lenses are a PITA to change. I have yet to fog my E-Flexs, but they are twice the price. The lense stripe doesn't block vision very much, but then again, you can always tilt your head down if it does, no big deal.
Empire Halo Too 90.00 ? Get the black one for 73.95 performs the same as the camo one or look around in the BST section, I bought one earlier this year for 40.00. Halo Too would be better for you then the Z-2. Plus you can find speed feeds for them around 10-15.00. Most fields don't allow shooting over 15bps, the Halo Too feeds 20bps so your covered there.
Ninja tanks are great but you can pick up a Crossfire for about 50.00 less that does the same thing and the reg is shorter.