I have used many years SD1 and I stil think that it is great overdrive. Ok, Hot Wax is more expensive, but result of using id is perfect. At first, it sounds vintage, but it is possible to set it modern. Another thing - many stompboxes are doing almost everything, distortion, overdrive, metal (it is music genre not sound efect) even fuzz (come on!). Hot Wax is only overdrive with plenty of "colors". Ok, sometimes it is similar to distortion but distortion is result of overdrive so...
Pros:
vintage sound
valve taste
very strong distortion
nice design
great possibilities for customization
meaningful price
Cons:
None
I have tested it on:
Fender Stratocaster Deluxe
Gibson Les Paul Faded 2018
Marshall DSL40CR
Marshall MG10