I am more than happy with my funfinder 189FDS. Two years now, over 20K miles on all sorts of roads. Just under 19' overall ( tip of tongue to back of trailer ), just under 4000 pounds ready to camp. You are right that the slideout really opens them up, from a usable space standpoint. Bear in mind my trailer has a "sideways" bed, which is sometimes a deal breaker for couples, since one may have to climb over the other to get in and out of bed in the middle of the night.
This trailer is a screaming bargain from a dollar standpoint compared to some others in the class.