i bought a couple of the steam links also when they were on sale. The charger alone was worth it, as its a perfect match for the original PSP 1000 models (only ones i have), and is a far better charger than any of the crappy ones you can buy for it nowadays.
The controller on the other hand.. not even worth $5. Worst latency in any modern controller since the DS3. Even worse than it in some regards, and just terrible at so many genres and games I love, like classic console games/emulation. If I were going to lug a controller around anywhere to use for convenience, it would have to work with those games at least somewhat decently, and this turd does not pass that basic benchmark like pretty much every other major controller does.