So there was a fairly massive update just at the simultaneous launch of Claptastic Voyage and the Handsome Collection which included virtually all the promised fixes. It looks like the developers were working to make sure that the update worked with all the platforms including XB1/PS4 from release. I'm maybe 2/3rds through Claptastic Voyage main story without touching a single side mission, and it's Tiny Tina good. The new glitched weapons are pretty cool (and can also be tossed in the grinder) while there are also some new shields etc. By the time you add all the parts together, it's something around 3 GB of additional content.
The environments and maps are varied and quite creative, and there are some neat things you can use to your advantage as you fight your way through (much like the caustic pod things in BL2 you could find growing in Caustic Caverns and Friendship Gulag, but with an additional effect.) There's also three practice dummies added (shielded, armour, regular), and you can apparently customise the difficulty of the arena/raid boss portion of the DLC.
I decided to tackle Claptastic with my TVHM Athena, starting at level 48. I'm now a bit stuck at level 50 - the final boss is also the raid bass, comes in multiple phases of increasing difficulty, and is actually quite a work out. I've gotten fairly close twice, but there's a lot going on and I still haven't got it all sorted in my head yet.
In retrospect, GBX/2K could easily have priced the two extra characters lower, and charged more for this, and (a) it still would have been a great deal (b) they probably wouldn't have been criticised so heavily on the cost of the season pass. I'd say it's definitely worth a look.