I prefer a field stock too but it depends on use. The only real advantage a pistol grip stock has IMO is being able to be held and used sideways, that's where it shines.
I like RxArms products, but I did have their charging handle "fall" out while pulling back on the bolt (I noticed I was slightly pulling outward while pulling back). The OEM does not have this issue, so I've decided to swap back to prevent an inadvertent lost charging handle.