I do them all daily(the pve ones) and it really piles up to good credits. Probably get more credits from the loot than the actual quest
For rewards, nice mods and earings, implants, and a couple of speeders. I wish there was more choices, hopefully they will add
Only thing I find is that at busy times it can get annoying(kill/item ninjas etc) and as there will be more and more level 50s as time goes by, it will get worst
edit: To add, for those who care about that, the quest reward does give pretty good legacy. However kills legacy not good. I play many alts but still find doing those dailies provide the bulk of my legacy points so far.(I am almost at 16)
edit2: Also note that the Belsavies dailes can be started at level 48(inluding the heroic ones), so one can start doing a big part of the dailes from 48 if they wish. It opens up while doing the Belsavis Bonus Series which can be started at Belsavis space port at level 48