During our white weapon challenge stickboy, capnovan and myself figured out you can get a good amount off exp of them. At level 45 you can get approx 6k exp off them. The best part is that you can spawn them as much as you want as long as you don't pick up the samples.
This missions reward is only a green smg so you can pick it up without worrying about a unique reward. Definitely helps if you are saving quests, or just don't want to do them like me, in tvhm.
Watch out they kinda get ridiculous if you spawn like 4 of them. Caustic caverns seems to level up with you so it applicable to about 38-50, I believe.