Been intrigued by these since it was a Magpul development project, but lost interest when it was handed over to Bushmaster, who butchered the release and overshot the original stated pricepoint by about $1k. The price seems to have dropped below $2k now.
Initial reports of poor quality and reliability seem to have gone away for the most part. Most owners rave about them, but caliber conversion kits remain nonexistent. If you want a different barrel, you have to have one converted by an aftermarket source.
Another version, produced by Remington seems to have several enhancements and other features that the market desired in the original product, but Remington stupidly has no plans to offer it to the civilian market.
Anyone here own one? How do you feel about it? Is it something you would choose over your trusty M4?