you can tell the difference i have only one in at the moment one blown so the stock when back.
dont know about the 100% but sound like crap but say 30% on mine but depends on the watts think thay make 55/60 though to 55/130 may not be suitable the higher one with todays plastic lenses/reflectors.
as long as if you go for utra blue ones keep the packet in the car theres on on the forum that got defect sticker for being to blue.
Go for it, I replaced the globes on my previous car with plus 50's, it was a lot brighter. Headlight globes do deteriorate over time, so you should notice the difference from your old ones. If replacing blown globes, then it's definitely worth the extra cost.