I'd be interested in hearing more specifically about how the inner workings of the spring-assisted clamp bases are "cheap" or "not a quality product". I own a 910 and one of the first things I did when I got it was to disassemble the clamp bases. The base utilizes an extremely simple mechanism and consists essentially of four solid metal parts. I'll concede that the bases don't use polished stainless steel handles like some more expensive spring-assisted clamp bases, but that hardly equates to cheap construction.
In the interest of full disclosure, I'll throw in that I think crank-tensioned stringers are such simple and basic machines that it's silly to pay upwards of $600 for one. I've heard comparisons like "the Eagnas is a Kia and the Gamma is a Lexus", but these comparisons fail to recognize that cars are complex machines and crank stringers are not. Basically, a crank stringer consists of a spring that measures the tension and some clamps, the rest of the machine is simply metal structure that doesn't affect the machine's performance. Unlike a car, a crank stringer is exactly the sort of simple machine that the Chinese can accurately and inexpensively replicate with little loss in quality.