The arms are alright, but I agree its the weakest part of the set with more limited range. They did a good job with the animal kibble being tightly integrated into the Sideswipe silhouette rather than looking like junk hanging off the robot. I also wish the headsculpt was better, the cannon part had a robot mode place to peg, and the beast head had more left and right range.
Everything else gets high marks. In comparison their other works (the combiners, Megatron, Optimus) feel sloppy. Gorilla had a similar vibes but this still feels like an improvement. I really hope they continue and do a better job with the Hot Road design. I really want to see Wolf-jack and Horse-Jazz.