I had the opportunity to demo the new ultravac for the larger decks today. It was on a 72 in. Lazer, and it worked AWESOME. We were cutting thick, 15" tall grass behind the warehouse, and it was unstoppable. We only traveled at about 3 to four mph for that because it was so thick. The bags (3) were pretty heavy because the grass was rather wet too, but the bags have handles on the bottoms to ease handling which I thought was pretty cool. We cut some other thick grass though at almost full speed and it just sucked it right up. It does take about a whole minute and a half to put the complete unit on the mower though. This unit should be out around February for those interested. I also test drove the new 3 cyl. diesel Lazer. Nice runner, but noisy.