It looks like it uses the same technology as turn-tech batteries. I put a turn-tech in my husky to save weight.
http://www.turntechbattery.com
One nice feature is that in cold weather the lithium iron phosphate batteries will self heat - so they gain in cranking amps as you hit the button multiple times.
I seriously doubt that these cost less than the yuasa at oem pricing - it looks like these are approximately $100 for the lithium-iron.
As far as weight loss - it is significant - the website says weighs 1/5 of original lead/acid battery (might be a stretch) - a quick way to drop a couple of pounds up high on the bike.
jeff