I was a bit nervous about attempting the wiring myself, but found a video on YouTube. It was a straight replacement for a Hayward CSPA-X1 - the wiring was the same - simply connect one power line to the 2 reds on L1 and the other power line to the 2 black on L2. And, connect the ground.
They supply 2 pipe fittings. These are a bit cheap and leaked when I put my 1.5" pipes in there - I had to use Pegatanke epoxy resin to stop them.
The only downside I can find is that my Hayward would come on when the pump came on (per a timer). This one is manually controlled. Thete are pros and cons with that.
On the whole, I'm delighted. It has cost me a fraction of what a new Hayward would have cost.