I like it
I read the negative review - and still went ahead and bought one of these! (a) I really did need something to put the shampoo bar in and (b) I am so-o-o in favour of non-plastic. So I went in with my eyes open and certainly without many expectations, but I have been pleasantly surprised: the design is simple but clever and it really does keep the bar from further wetting in the shower once I've finished using it. However, having said that, I do not use the conditioner and I can see that it would be a cozy fit for both, so I can imagine that having two wet bars which would inevitably touch each other could lead to some glugginess.
A side comment: I already knew how efficient Healthpost is at delivering, but this one beat them all. I placed the order late morning on one day and it was on my (South Island) doorstep just after 8 a.m. the next!