My issue with the detachable magazine is not a criticism of the gun, but rather of its suitability for how I will use it.
The detachable magazine is a compromise that you make in the ergonomics of the gun in order to be able to quickly shoot more rounds than the gun can hold internally. In thirty years of hunting I have never shot more than three rounds at a time in the field. And in all of the occaisions where i have shot more than two, the last was after I walked over to the down animal. I can pull a round out of my shirt pocket and top off a conventional bolt gun while I am walking through the brush. I don't think I can do that with this magazine. And I don't want to carry another magazine.
The only time I ever need to shoot more than 4 is going to be on a range, where by definition, I am not going to need to reload quickly.
For me it is much quicker to load the rounds into an internal magazine than to take the mag out, sling the weapon, wrestle the rounds into the AICS mags, then unsling the weapon, then insert the magazine. With every other bolt gun I have it is simply pull a round out of my shirt pocket and put it in the gun. The rifle stays in my hand. My eyes stay downrange.
The magazine is also another point of failure for the rifle. I am sure that the AICS magazines are well made, but if I step on the receiver of a rifle with an internal magazine it will still feed. I cannot fail to insert it all the way, the mag release cannot fail or be inadvertently pushed. If I step on that high quality AICS magazine, I might end up with a single-shot rifle.
Detachable magazines are a feature that enable the rifle to do things that a rifle with an internal magazine will not do. But these features come at the cost of some level of ergonomics and reliability. I appreciate the features, but they bring performance that I personally do not need, at the price of ergonomics and reliability that I value.