I don't own any of them, but I'm deciding on a cheap dedicated film scanner as well. First I'd suggest you read through the scanner forum threads. There's many on the subject. And keep in mind that it all depends on your workflow and/or preferences: manual/auto feed (and that means contact sheets, archiving loads of old slides/negatives or just "the best possible result from a few frames on every roll"); internet publishing/large format copies; 35 mm/roll film & larger formats; clunky software, be it Vuescan or Silverfast; a long learning curve (in case you're new to scanning) etc...
What's bothering me though, is that there are much more complaints about the Reflecta line of scanners on the forum than on the Plusteks. And 'though the complainers allways make more noise, this is a forum with many US members, and Plustek seems to be easier available in the states as well (and no, I don't think chauvinism is to blame 😉).
My thoughts so far on both brands (disclaimer: just from reading):
Reflecta:
good: faster than the Plusteks, but that could well be software related.
bad: more expensive, especially when buying into Vuescan or Silverfast; many complaints about banding, light source giving up after a few months; the auto feed of the RPS seems to be problematic.
Plustek:
good: cheaper and come bundled with Silverfast, which for some is a PITA, but at least it's included (but for your newly bought scanner only...). Weighs 1,5 kg, as opposed to 1,0 kg of the similar Crystal and Proscans from Reflecta. Don't know anything about this, but it seems there's a little less plastic inside.
bad:much slower and apparently producing much larger files, that take their time to downsize in PP.
On image quality, both seem on par, same resolution more or less, same D-max.
So... Good luck with your choice, and tell us your decision.