Have used one as well and can attest to this. Number 3 drove me nuts. Couldn’t figure out what the problem was. But I discovered that it’s solely an issue of running the bolt like a man.I've used one for two seasons. To be honest, it's not the best for PRS.
1. Rear heavy. On positional stages, I would prefer more weight forward.
2. Weak side shooting is more difficult due to bolt manipulation
3. Bolt manipulation can cause spent brass to bounce off your hand and back into the chamber. This happens more when you are in a weird position and run the bolt slow, but it happens.
4. When shooting a positional stage combined with a rear support, like putting your rifle over barricade and tripod leg to support the rear, bolt manipulation becomes more difficult. This is because the bolt travel path can intersect with the tripod.
5. Single loading is more difficult.

That said, I personally don’t shoot matches for anything other than fun, so the rest was no issue. Since I started making a point to run the bolt hard it has been fine.