Well, some ppl may have had problems with their probes..or mx6's or any other car out there on the road.
Ive had my '94 mx6 (same platform etc as the probe) since new, and have not had any major problem that other makes/models havent encountered...
Check out...
http://forums.probetalk.com/ and see what owners have to say....23385 members Im sure can give you some input.
Automatic tranmissions are an issue, some have had rear brake caliper problems and the ignitor in the disty has been problematic on the '94s - as I did, tho mine is a manual trany... - but then again, Ive had to change the alternator twice on my wife's '95 Monte and her A/C still doesnt work......so much for trouble free cars. Theyre arent any!!!
I do think that $4500. may be a bit high for that probe.