Cool, but just a tad pricey. Many games let you save to a VMU in any slot, so you'd just have to plug in a second controller with a VMU. I like that it has X-input for 360/XBone controllers or really most modern PC controllers.
Slightly off topic:
I've been playing Sega Rally 2 on PC with an Xbox One controller and on Dreamcast with the standard controller. The stiff analog stick on Dreamcast never bothered me until trying to play this game. It would be nice to use the Xbox controller on the Dreamcast, but I don't know if it would be worth it to me to spend $40 to do so.
PSO Dreamcast 100% Legit: Eda FOmarl, Automaton HUcast