Only partly, the prop itself and the slider are good on the cheap ones from my experience. The UJ's are terrible, but are also cheap and easy to replace. A pair of good UJ's and a cheap prop still works out significantly cheaper than an OEM prop and IMO would be of equal quality. (or certainly not of a large enough quality increase to justify the increase in price.)
Prices taken from Bearmach website as they stocked all the parts for equal comparison (aftermarket prop and UJ's are considerably cheaper from paddocks)
RTC3291G - £12.78 - OEM UJ - (
link)
FRC8386 - £100.98 - aftermarket fromt prop - (
link)
FRC8386G - £180.00 - OEM front prop - (
link)