I'm not a "real" Hammond player, so normally I'd be fine without a half-moon switch, but the placement of the Leslie button on the Mojo Classic is so far off that it's just really convenient (if not essential) to have this switch at hand.
Be aware that the switches for the 61 and the XT are wired differently and that the Classic requires the one for the 61. I ordered the wrong one first which ended up acting strangely. Thomann's customer service was helpful in fixing that problem.
I rated the quality at 4 stars for now. Somehow it feels slightly less durable than the original (Hammond), but time will tell. 4.5 would have been more accurate.