In the FoxPro line up, I have used the Shockwave, CS24, Krakatoa II, Xwave, X24, and X2s and probably a few more. As DoubleUp states, the TX1000 remote is fantastic. I like it a lot and it works well for Night Hunting. However, one of my only gripes is you can do so many things on the remote, so there are lots and lots of buttons. I would prefer a simpler controller with fewer, bigger buttons. I have likes and dislikes with all the FoxPro units, but you mentioned connection. The remote range has been really outstanding with the exception of CS24 and Krakatoa. For whatever reason, I didn't get as much range with those eCallers. I don't like the process of adding sounds on those two callers either.
I currently have the X24 and X2s. I absolutely love the stands that come on these calls. I use the X24 more because it is louder. The X2s can play 2 sounds at once and has bluetooth, and mine came in camo but it is more expensive. I don't use the extra features often and with the added expensive, I would go with the X24.
I agree with Double that I hear of lots of satisfied callers using Lucky Duck as well, but I have zero experience with them.