I have 2 pots of the conditioner tubs since my first purchase about 4 or 5 years ago but I've only used it a couple of times a year (lazy as I said before) and with shoulder length hair I just apply to the ends from about half way down. The cleanser seems enough for my hair on a day to day basis.
I hope, if you buy it, you persevere for a fair few applications of the cleanser because it does take a while to find the right number of pumps and rinse (did I mention rinse?) really well.
If you still don't get on with the cleanser you can still use it as a conditioner after shampooing, or flog it on ebay where it gets pretty good prices even for tested bottles.
Miss Molly some of my favourite products are from Avon - I'm all in favour of cherry-picking from any brand that works. Avon do a couple of products that are unique to them which are great on my skin.
It's tough recommending products because they won't suit absolutely everyone so I hope if anyone has been convinced by Donna or me to try Wen isn't disappointed.
Lastly, the cleanser being slightly minty is lovely an cooling if you're having hot flushes (I drive the family nuts by turning down the temp on the shower) but a final 30 seconds of cool rinsing at the end of the rinse cycle helps close the hair cuticle and adds shine. It also means I'm not already sweating when it comes to blow-drying!