The ones I run are made by spal, but are basically the same thing. I've installed these things on two vehicles and they work beautifully. They are quick and easy to install and I find they are able to put more torq onto that window than my arm could by hand. The ONLY downside to them is you have to put a cap on your door panel to hide where the splined shaft for your window cranks comes through. Not a big deal to me but to some it's an issue. I will be buying more of those things in the future, that I can guarantee you. 
Do you have the link for the source of the Spal ones?
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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