I just picked up a MS1 to try out, haven't had any "hang time" with it yet. I do like the slider over the VCAS though, quicker to locate and it's lower profile. I will be using QD points on an AR first then may try the hooks on it for the AI. Quality is just as good as a VCAS, the material seems a tad softer. On a bolt gun, I pretty much need two adjustment lengths, hasty/normal shoulder carry, then enough length to run it out for cross sling. Quick and easy and may end up using the MS1 for the bolt-or just stick to the old GI one.