A Bolts are plenty fragile, especially their triggers which aren't good in any other way either. I had 2 in the distant past and ruined an extractor each as well.
They also seem to be in a contest with Savage to see who can make a rifle bolt out of the greatest number of parts and although I've broken none of the former and several of the latter, they don't inspire confidence.
I have had nothing but good experiences with Abolts. I have one in 300 wsm and my buddy has one in 30-06 and it is stainless with a synthetic stock. No issues and is accurate out to 200 yards. He has not tried to run it past 200.