I had problems with d'Addario Slowounds in long scale, where the A string was to short to reach the tuner on my 34 Epic. No problem with the d'Addario XL long scales, at least not on my 32 Spoiler. There seems to be enough length left over for the extra 2 on the Epic, but I never actually tried them there.
There was a discussion about the varying distance between tailpiece and bridge between instruments - so it might be more of an issue on some of them.