So far from my own experience I Noticed that Visa Mars falls off quite well due to her missing important tags, and these 2 new heroes only really have the smuggler tag. So they are not really useful in most aspects of the game, especially after the BH Rework where most people will have those ready to do everything scoundrel (And everything Bounty hunter - again, making them a better choice to invest in)
With Visa's I noticed her use is only for places like Arena and an extra in TW, because of no good tags she can't help in Assault battles, not for legendary fights or anything. Same goes for these 2 new heroes.
Which is kinda sad in a way, that to me tags hold back some heroes from reaching their potential in both battles and usefulness. Both this new han and Chewy don't even offer anything to R2d2 ;-;