Hmm... I almost feel that a LA+1 is a little too generous. I mean, you're getting 3 immunities, 2 resistances, natural armor, a fly speed, a supernatural ability that you can use every round, and stat bonuses on top of all that. Granted, it does have that 3d6 racial HD, but I feel doubtful that a 4th level rogue could stand toe to toe with it. I would feel more confident saying it deserves a +2 or more LA. I mean... Look at those defenses it gets lol. But that's simply my opinion. I'm really loving this whole thread.