I got a whoosh radiator.
The, "bracket modding" isn't that bad. the radiator has rectangular brackets that slide onto the support mounts to stay in place, those were a little tight. Literally all I had to do was stick a flat head in there and bend them out a bit so that they slid onto the plastic mounts, after that it was about as hard to do as any other radiator in a compact modern car. The Mountune one is thinner so you may have better luck sliding that in from the top instead of having to take the bumper and crash bar halfway off but I doubt it.
So far it has held up great against the southern Arizona heat with a car that gets driven hard.
I will say the fan shroud fitment could be a bit better but it isn't bad.
The hottest I've seen my coolant temps go is 214F on an evening summer run up our local mountain. 5500ft gain over 26 miles.
If you care more about great function at a lower budget, Whoosh. $354 shipped.
The Mishi is ever so slightly thicker, so in theory it can dissipate more heat and take longer to get hot but between me and my buddy we never saw any difference in performance. His is a tiny bit harder to work on because it takes up a bit more space. We are both S280 + single port on E40. $550-600+~
Pro Alloy if you're rich and don't care that returns are diminished $800-1500+~
Mountune is thinner, ease of access is better, cooling idk. Their customer service is pretty shitty from what I have gathered on this site, take months to send out gear, never reply to customers inquiring about stuff they purchased months ago and never got. Also heard they're under new mgmt. though, so they may be better now. 550-650+~