I've used this 'lightweight' 5L pack at a heli operation in Alaska and also a 50L ABS pack when touring.
I'm quite conflicted about the ABS airbags because they're such a fantastic backcountry safety device, but really let down by poor pack design and straps.
The airbag part of the pack is great, no doubt it's a potential lifesaver in avalanche terrain and that's fantastic. Having two airbags is a nice redundancy. The logistics of airline travel with the gas cylinders are a nightmare though.
My first beef is with the removable activation handle. IT'S WHITE FFS *&%#$!!!! Yes, that's right - it's the same colour as the snow. WTF? Did they run out of coloured plastic? Not such a problem if you're touring, but if you're heli skiing (you have to remove it from the pack to prevent accidental activation in the heli) and you drop it in powder as you're removing it, it's REALLY hard to see.
The straps, particularly the waist strap, on both packs I've used are substandard and loosen by themselves and I had to continually tighten them. I'd hate to see what happens in an avalanche.
The good news is you can buy the ABS base unit and get a zip-on pack from another manufacturer, which is what I'd recommend.
Some people complain about the extra weight. I can't say it's a problem for me - you can't have an omelette without breaking eggs.
Personally, I'm going to wait to see what the newer options e.g. black diamond jet force are like before I commit to buying an airbag pack.