They're cheap ($30-$40) but are they reasonably good?
In a word no!!!!!!!!!!! they're plastic and noisy i bought one and never again save an extra few quid and buy a second hand boss or electro harmonix!! you've been warned!! read the reviews on UG
Anyways, no, they suck.
They aren't as bad as people make them out to be...if you're on a tight budget they are very appealing. Check out some of the review videos on youtube.