I am currently doing some research on solar panel and have a good idea of the hardwares and what to balance
Regarding the tariff, looks like the highest is Origin at the time of writing. A catch is to buy their solar hardwares, which also seems to be a decent price
Any experience on origin and other providers? Any catches have you found?
Many of the higher FiT will have some form of cap, only applying to the first 10 or 20ish kW/h exported or maximum inverter capacity, so take that into account. Unless you can self-consume almost all of your generation those plans may not work out too well despite the high advertised FiT. I installed a 10kW system and have reached over 70 kW/h daily export in summer so you can see how the actual average FiT can end up much lower.
I found Powershop to be a pretty good option (was 13c, now 12c FiT, max 10kW inverter capacity but no export cap as far as I can tell), but you do need to run the numbers on the import rates vs your consumption habits to see if it’s worthwhile.