I have used them LOTS of times as a secondary, and more than a few times as a primary, with no noticeable ill effect. As a matter of fact in my case, it is my go-to fermenter for 2.5 - 4 gallon trial batches. As always, YRMV. ( Not that I think so, but best to cover my arse, LOL )
Case in Point - my current beer honoring Charlie Sheen - "Winning" Ale = was a 2.5 gallon batch made with 2.5 lbs 2 row, 2.5 lbs corn, and three 2.5 oz hop additions of cascade at 60 min, flame out, and dry hopping.