Yes I did one of their waves last year. It's very good as long as you stick to it 100 %
There is a lot of food prep involved though which does get very tedious. It's a low fat & low carb eating plan which can be very restrictive so be warned if you've got any social occasions coming up which involve food. No alcohol allowed on it either.
The exercise is generally doable as it builds up gradually over the 11 weeks and you get a lot of support from the Facebook group you will be put in.
Don't bother buying the battle rope directly from Six Pack Revolution, you can buy one for half the price on eBay or Amazon. And don't bother buying their branded shakes etc. Just check the sugar & protein content against the much cheaper supermarket own brands and buy those instead.
I reckon if you stuck to it religiously you could lose up to 2 stone. I didn't stick to it that well but I still lost a bit, and got much fitter.