Just wait until you get a bad one. "Thundertiger Bad Service At Ace Hobbies :"
http://www.rcuniverse.com/showthread...ght=tt+service
Search: tt service or Ace service or thunder tiger service, and you come up with nothing but bad news.
ABN vs ABC? I like the ABC or AAC(chrome liner). It'll probably last a lifetime but if it doesn't, you'd like the mfg to stand behind their product. Mecoa has great service, but Leo does not(same engine, like asp and magnum), magnum(hobby people), tower, tiger shark(kangke), and MDS(horizon) have great service also, but don't get an MDS unless it's a .58 or better the .48's are dif to get adjusted. Service has to be a big part of the decision..