I know this is a terrible picture, and I wasn't going to post it al all, but I just installed the Superior Cape from Tony and wanted to let you take a peek. I used the pin mounting approach, so I'm still training the cape to lie flat.
No doubt that Tony is recommending the exacto slit method for Superior because there is a good amount of extra material to deal with making up the new pleats that needs to be "folded over" when using the pin method that you can simply tuck into the body with exacto slit. The difference is essentially two ply (pins) vs. One ply (exacto slit).
I think that difference can be overcome by letting the cape settle in for a bit and then possibly a little steam if needed.
All this may seem like a lot of extra fuss just to go with the pins, but I'm just not willing to cut into the chest and hope the slit is the proper length and depth to hold on to the cape forever. Do it wrong and you could destroy one of the best pieces Hot Toys has ever made. Not to mention all the custom work I've already invested! Anyway, hopefully more to come:
Oh! And I almost forgot. Take a look The extra length Tony included on Superior! I think it looks great, very true to the movie. How you choose to mount the cape wii of course have some impact on overall length, but I think the pin method I went with would tend to shorten the cape a bit compared to Exacto Slit. But even so, I'd say my Superior is easily a quarter to a half of an inch longer or more than my Stadard Tony Mei MOS custom cape...