I submitted to Jacqui Lipton, and she was very encouraging. (Didn't sign me, but invited me to continue submitting. Which I've done with my latest and am waiting to hear back.) They have signed a number of authors, it seems, and posted several deals on Publisher's Marketplace, for Jacqui as well as other RQ agents.
I've subbed to Jacqui and she seemed super nice and encouraging with a personalized rejection (which is getting rarer and rarer to get these days.) When I checked Pub Marketplace, they seem to sell to some pretty good places. I plan to sub to them again with another MS in the future.