I upgraded from a V6 Animal to the new V8 even though there was nothing wrong with my V6 which I've always been delighted with.
Was it worthwhile ? Definitely - greater suction and improved capacity together with an improved emptying mechanism.
The refurbished route saves you quite a considerable sum and I doubt you could tell the difference from a 'brand new' machine.
Dyson are expensive but I don't think there is anything on the market that is better ..... and the best just got better.
It will take a bit longer to give conclusive feedback on these capsules. I'm using them along with the massage oil as a result of a recommendation. First impressions are good but I think it may need a longer period of use before I can give any useful feedback.