I made myself the guinnie pig and I like it !
1. Yes an no. At first they are a little weird to load because they are different than any other 10/22 mag out there. After you read the directions and load it ounce they are real, real easy. After you get the loading procedure down you can load them faster than the 25 and 30 rounders as the bullets just drop into the belt after taking the cover off and using the hand crank in the center to wind the spring.
2. To clean and load them all you do is remove the rear cover. Although cleaning coesn't seem to be an issue, the mags after all those rounds inside were hardly dirty at all ? I have no idea why but the only powdered and dirtied part was the metal feed lips on the mags.
3. Yes it does and it makes loading them into the gun easier. I know this because the three 10/22's I shoot on a regular bases run rim fire technologies extended bolt and mag releases. When loading it helps out because they are such a tight fit you half to push the release while loading them in the gun. Also, they don't use the factory front holder hole, they have edges that snug them against the front mag well, I think this why they are so tight and have almost no wobble. I think the tight fit is why they feed so well, no wobble like the Buttler and Ramline mags. I tell you they are well worth the price and I love them. Look around though because my buddy said he found his recent three for about $60 on a different website.