re: Matchsaver
I will echo what Tim said.
I have been running a Matchsaver on my 1301 for about two years now (since I got back from the Rangemaster Shotgun Instructor course) because I thought that if I need a reload, I will REALLY need a reload, and I wanted one as fast as possible, and this seemed to fit the bill. After spending a good deal of time coming up with the right place to mount it and making the mount as strong as possible, as I am wont to do, I went down the rabbit hole of training to get good at it. I spent 4-5 sessions a week in dry firing learning to get that round in as fast as I could ever manage. At this point, I am super confident in my ability to do so.
And now that I have done that, the MatchSaver no longer is on my gun. I have not found my hand ever running into it (though I can easily see someone doing that especially if they just slap it on and don't really practice much with it), but I concur with everything else Tim said above. I spent a boatload of time honing my ability to load that ONE SINGLE round, and there is no real carry over to other loading methods. While having a single round being able to get dumped in and fired is nice, it is more likely that at the point I need to reload after firing 7-8 rounds, I will need more than just one more, and I am going to have to go back to other ammo carriers to do so. On top of that, I have found under time that spending the same amount of time drilling in the ability of loading from a side saddle gives me a reload of less than a second slower than the magsaver, but I can keep doing that for 4-6 more rounds. So it seems a lot of buck for not much bang.
But the killer is that the attachment method sucks donkey balls. It is flimsy as hell. Every time I packed it for the range and I pulled it out to shoot, I was half-expecting the magsaver to be ripped off. It is just not strong enough for a life saving piece of equipment. My original mental argument for that was that it's main use for me was as my home defense gun when I can bunker up, so it probably would not have that outside stressor. Unfortunately, "probably", is a sucky thing to count on when my life or more importantly my family's lives may be at stake. It seems monumentally stupid to put time into practicing a single skill with a specific piece of equipment that with just a little bad luck may not be on the gun when I need it the most.
So, to sum up, for me, after two years of use, it is no on the no-go list for me.