I was going to get the MKIII earlier this year but once I saw how easy the MKIV is to take down - it was no contest. I've had mine since about February. I love it - the added weight of the Target model is great, fun to shoot, ammo is cheap. I did have some frustrating ejection issues at first - turns out it was due to: 1) the place I bought it from initially sold me a few boxes of CCI .22 LR HP ammo. The hollow point didn't work all that well (fine in my rifle - not the pistol) and 2) I took it apart, cleaned it throroughly and oiled it well. No issues since then... With 5 mags I would easily cycle through 400+ rounds and no issues since then.