I guess you said similar things but i actually disagreed with the guy who posted above me who said 99.999% of them will smash your tank and i agreed with you. Ille admit they can break glass but really how often does it happen. Ide say more like 5% if they are kept in anything with a decent thinkness glass for the size of the mantis they have. I see your a member of reefcentral too so should know there are probably a 100 or more people on there who own mantis shrimps and plz tell me how many of them have had there tank busted??? Not to many from what ive seen.
Now onto your questions. I have had 3 biggest one about 4 inches and kept in a 3' glass 140l tank (im aussie so we dont use gallon sizes). 1 in a 2' about 50l glass tank and one was kept in an acrylic tank not for safety it was just a small empty tank i had. I also work at a LFS so hear things from customers and have caught quite a few from live rock deliveries. I havent done experiments or recorded things if thats what you mean by research no, just watched them at home, at work, and heard other people experiences.
Now some questions for you. How big where these mantis that busted someone you knows tank and finger???? Im betting not a small species of about 2-3 inches like ive recommended people get.
How many have you owned??
What research have you done and what are you scientific findings on mantis shrimps