I was woundering about the 400mm primes some more?

I posted a couple days ago about my older Sigma 400mm 5.6 AF prime lens i was having trouble with. But i really like the lens I know there are a couple differant models out there.

400mmAF5.6 prime

400mmAF5.6prime APO

400mmAF5.6prime APO HSM macro

These are all SIGMA lenes that they came out with it seems the first one on the list has a real problem with Sony Alpha's and the AF tends to strip out .

I have been looking at a used Sigma 400mm AF 5.6 APO At the local camera store for about 200 with a 30 warranty i was woundering if these have the same problems as the first 400mm sigma prime lenes.