I have a dozen Amiga's currently and have sold off 3 or 4. Had 1000's, 500's, 2000's, 3000's, 4000's, and a 4000T. None of them ever died. I did blow an Agnus one time however.
I had a CSMKIII and PIV quit, but I blame that on the guy I bought the 4000 from. Really crappy shipping . The CS lasted about 10min. and the PIV never worked.
They have been rather durable all in all. Never had one of those "toy 1200's" though :-D