Not sure if this is the right place to be posting this, but I was looking for a crank puller. I don't see myself using this often as I just want to switch out a set of cranks from one of my bikes and my only other bike has self extracting cranks. So, I was looking for a budget crank puller. I took a search on ebay and saw some cranks for under $5 but I was wondering how they compare to something from say park tool that goes for around $15? Is it cheaper mainly because it is of inferior quality or is there some user friendliness in the more expensive tools?

Cranks in question: