Ive found Arthis fun and Mandalorian Raiders a bit of a challenge at level 25/26 group Try that one. There are 2 boss(s) fights that are pretty challenging to lock down aggro and also stay on the damage that happens in them. I also think that the instances having things in them for crafters is different and pretty neat. So far, Ive noticed an extra boss with a biochem as well as fighting pets, scavenger getting shortcuts and pets, slicers getting shortcuts and I think a bonus boss with an arctifact dude. I also found a couple areas that I could use my force leap to get to an area otherwise not accessible and there were loot boxes there.