It depends what you're looking for.
As an arena character? Probably not. Clones tend to be weak in arena (due to enemy Rex leads and overall low burst). He works if you have better mods or a weaker meta, or don't care about facing meta teams.
For GW, if you want to run clones, he's is essential and hilariously fun. Therapeutic clone GW makes the grinding bearable.
For raids he's pretty awesome against the rancor, less amazing (but not bad) against the tank.
The real question is what other toon are you pushing back to gear cs for? If it's a vanity or other "fun" toon then he's worth it.