Not a direct review, but lots of feedback posts are around. His sales thread has a few here: https://budgetlightforum.com/t/-/22440, but I know it's massive. The mod method and driver UI has been a culmination of efforts here that Richard himself was directly involved in. I know more info can be found in threads, but not sure where off hand.
Though I don't have one of his modded lights, and can certainly vouch for his expertise and attention to detail. He's been on the bleeding edge of the new design/mod work here. I have bought a lot of parts and hosts etc. from him - and service/support is 5 star. All reviews of his lights I've seen have been very favorable - you have nothing to worry bout, but if you can't find info on the modes, I'm sure he'll respond pretty quick to a query, either pm RMM (Richard) or via his website.