Got a mixed pack of the three types of bullet that they make and got as far as starting some load development before the lockdown. Only managed to shoot a few on the zero range and at 300 yards and there didn't seem much difference between the Wimbledon Match and the Mistral at that distance. The Mistral-T's seemed a bit of a novelty but shot well enough too.
Load development was complicated by the fact that the chap who makes them won't provide any BC information so you'll have to work that one out for yourself. However quality was generally good and the service from MME quick and easy.
Unfortunately his website seems to have closed down so obtaining them might be an issue, although I think you can get them through Shellhouse, which is where I first saw them.
Hope that helps.