TLDR: Reefi remains the value king as
@telegraham has said.
Imo, not even worth spending $300 on the A8 if you only need one or 2 for a tank.
I just got my lights today. A8SE. The cord is a foreign one, but it comes with a very suspect adapter. I'll be replacing the 120v cords with old extra ones.
The X-arm brackets snap in place nice and tight, but the center hole on all 4 has a fracture from the factory.
Won't have a chance to get them hung over the tank for a week or so. Plenty bright. I stand by reefi over the A8 "upgrade" model. For a sliver more money. You get a far superior light. Admittedly, I've never used radions, kessils or hydras. Only cheap crap, DIY, and my current ancient AI sol Blues.
The Reefi UI isn't an app, but just a web portal. No big deal. Seems better than a broken app.
Assuming a viparspectra only draws 105w like other black boxes, I'd definitely go for these. There are lighting presets and schedules. You can even download and upload custom presets publicly, as well as save them privately. Not sure the timer function is working, as I only have a 1hr ramp on each end and 100% power for 12 hours between since that's how I'll run them.
Definitely the same nasty light spill I've seen from radions. The reefi is no BS in that regard. Very little light spill.