Shotgun drum magazines

[Cannonfodder]

I'm thinking of getting a drum mag for my shotgun and I've seen ones by battleaxe and nuprol for £40 and £45 respectively. Does anyone have any experience of these and if so would you recommend them? Also is it worth spending the extra fiver? The nuprol one is sound activated but the battleaxe one isn't.

Edit: nevermind, I found a video of one in use. Bloody hell they rattle