are these air brushes good?

i wanna learn to airbrush, looking on ebay i see some without the compressor (my dad got a small airgun compressor already) for like 15-30 buck range. just wondering if these are decent guns to use? heres one auction for example. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2370966812&category=28111