Well, since posting the OP a few months ago, I have indeed geared them all up considerably:
https://swgoh.gg/p/792672567/characters/?f=Smuggler
I ran Qi'ra, Vandor, Han, L3 ,and Chewie for a while in Arena, but that team absolutely cannot beat Revan or Traya. A few notes on what I found:
-Young Han is a Raid-Wrecker. Most useful for Tank raid, but also good for P2 on Sith Raid. Other than that, erm, he's kinda lackluster in PvP.
-Young Lando is almost entirely worthless, except his ship. Lando's Falcon is basically a Coup de grâce to the enemy fleet if called in as the third reinforcement. Three immediate turns while dispelling buffs and debuffs. Still viable against any/all fleets, and an absolute wrecker of the new MF.
-Range Trooper might be the BEST solo toon. I toppled a full G12 zzzRevan team in the last TW with zVeers, Starck, Deathtrooper, Shore, Range. Range Trooper makes the Imperial Troopers team SCARY good.
-L3 is a beast of a tank, but not really PvP viable with all of the Revan going around.
Overall, the smugglers they are a solid team that can surprise people in TW, and can be useful in other parts of the game, but not anything top tier. I would compare them very closely to Phoenix, where a full G12 team with zetas can easily be underestimated, and Lando's Ship is a really great overlooked ship.