Wow! These are some epic mags. Although they cant be efficiently loaded without a speedloader they are pretty beast. I'll cut to the chase and give the pros and cons.
Lightweight, so you can carry more
Hold 110 rounds. Nice.
Works with CYMA Thompsons, both the typewriter and the military edition
Lightweight plastic. Feels fake.
When I tried to pull out the mag, I panicked. It wouldnt slide out. However, you just need to pull it out with authority while keeping the mag release up and it comes out fine. This means
You need a speedloader to refill these at any type of decent rate. This can be pretty dang annoying if you never needed one before.
Rating: [4 of 5 Stars!]