I got him at first pull yesterday... so I've upgraded him up to purple +3 (I'm level 82) and I can say:
1. great damage, the hero is definitely strong as seems.
2. very fast charge!
3. bad lifesteal
4.he died too fast!!! it's very similar to volt!
at purple +3 he has about 14k health, while my lars has 16k health with same fusion level and same stars (3). Lars much more durable. Why? Should I open another chests for upgrade him to 4 stars? or he is definitely weak?