I've had my second hand G5 for 8 months now and so far has lived up to expectations. Dog, cat hair two boys tramping about. It fluffs the pile on the carpet etc. What I want to know is how do you find the shampoo system? I've only used mine once and forgot to put head on the lowest setting. So job was ok not fantastic. Any tips on best way to use it? Also has anyone used the floor buffer on tiles?