Just managed to unlock him too, have him 4*, 7s Abilities & 8 gear. Is a tad underwhelming at the moment. But at the current farm rate will take another month to take him up to 5* so feel he's a touch underpowered for the investment (hits about the same basic as my 4* HRS and his lack of speed & health making him less viable despite the cool extra effects)
Am going to try to build him into a Lobot/JE squad to buff speed etc but think he could do with an overall boost given the price (or a really steep escalation for 5* / 6*)
Conclusion: he's a bit of a white elephant right now, don't mind grinding shards for ever to get there but think the reward is limited (very cool graphics though)