My Dad's got at 6" reflector. I've used it to peep the rings of Saturn and moons of Jupiter, but it's a bitch to compensate for the rotation of the Earth at max resolution unless you've got the gimbals properly lined up for your location and have a decent tripod/gimbal setup. My Dad's was less than awesome and it meant accidentally swinging the field of view around the target as the mechanism bound and released.
Other than that, I don't really have any specific help to offer. My guess is with these things, you get what you pay for. Since telescopes aren't really mass produced, the cheap ones are probably the crappy ones.
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