For years now I've had a Wahl Belissima, and the battery has gradually been getting worse and worse to the point where it pretty much needs to be used corded. I paid £100 or so for it, but have saved several times that in costs to the hairdressers.
I decided to replace it, and was going to get the same model but then I noticed this newer Lithium Ion Pro. Spendy, sure, but in my mind it's already paid for. Is it a HUGE improvement on what I had? Well, it looks nicer and sounds quieter. It also cuts a bit better but that's to be expected given the age of my old one. Overall a fantastic product, does just what I need. Worth the money? Same can be asked of a good £200 shaver... for me, yes.