I got mine and out of the box it wouldn't pick up suppressed shots, maybe 50% unsuppressed, and pistols I had to shoot from one specific spot (tested for about three days off the back porch). Totally frustrated I emailed them with a *** email and they handled it very quickly. I think they may have even sent a return label? They tore it down and found a defective mic (which they said mine was in a lot the suspected as having them in our first email). Turned it very quickly as I recall.
Some other folks talked about external mics, mine now functions flawlessly to include .22. I don't recall trying .22 pistol suppressed or subsonic ammo but I'd bet it picks it up.
I would never go back to an optical chrony that has issues with light, not enough light, to close to the gun, to far from the gun, gets shot, etc. I also like it over the magneto speed because I can set up once and fire multiple firearms in a single sitting (I have four children and two of them are developing their own loads now so it gets busy for the chronograph).
It's a big investment but totally worth it IMHO.