I loved my first docksider so much that I bought a second and I'm now considering a third. They do pull a lot of cars for their size. My only complaint is the whistle sound but that could be upgraded and the value makes it worth it. The couplers can be delicate but I ran mine into the front of a steamer that had no coupler so that's probably got a lot to do with it. I have the replacement but haven't put it on yet.
I bought a bobber caboose recently. I intend to store a board for TMCC or DCS in that. Then I plan to attach a dynamo to the docksider and run a "power cable" from the dynamo to the bobber so the bobber has power. The conductor will do his freight paperwork (in the 1940s and 50s) in the bobber while switching. The cable will hopefully double as a tether for DCS/TMCC. We'll see! Maybe the minicommander from ERR will fit in the body of the docksider on it's own.