I'm with you on the blue Comfort. Not just that but now it makes me itch, even the pure one, something it didn't do before.
Been using LEnor for almost 2 years now, and although at first I really hated the scent of the blue one, it's almost exclusively the one I use now, although at the moment I'm drying out "A Breath of Fresh Air", one of the new Infusions ranges (2 for £3 at Asda btw), and incidentally it smells more like classic Comfort than Comfort blue does now!
I used to think, 2 years or so ago, that Persil was well superior to Ariel in terms of cleaning and rinsing, but it's rapidly gone downhill, especially seeming as Ariel appear to have solved the oversudsing issues that I always seemed to get.
I'm still not keen on Fairy, though. That's the only P&G washing detergent I utterly hate, same with their dishwasher tablets. Not used their washing up liquids for a while (that while being 3 or 4 years), but when I moved in here I bought Fairy liquid and I'm surprised at it's performance. Mum and Dad use anything between Persil, Sainsbury's own or Ecover washing up liquid at home, and Fairy liquid seems to be better than all of them, especially important considering we don't have a dishwasher here. Persil washing up liquid is another product I won't ever use again! Horrible smell, have to use loads of it, and too sudsy!
Jon