Advise on air tools/compressor??

I bought a set of tools at costco pace in some states for just under $100. I have everything 1/2" impact ,die grinder , 3/8" flat ratchet , 6" variable disc d a sander air chisel and cutter some sockets . altogether 5 air tools . When all added up it was a little less that Harbor Fraght and it sin a kit with accessories. So look around there are some good buyes , I realise that they are not the quality of the proffesional tools but I am not in the businesss and as cheep as they are if one brakes I can replase it for under $20.