Welcome to the forum Oliver
Done some looking on the net, do you mean the ones by Night Star fireworks? if you do, the Massive Assault pack is 1.4g, so fairly crap, but Massive Assault 2 is a 1.3g pack, so considerably better, and most likely a good buy hope this helps
I had them last year at a bonfire I went to and the bigger rockets were quite good but the smaller ones which you get loads of are not great and got a little Boring as there were quite a lot. These were the massive assault 2.