well I got speaking to a wc'er near me (who has asked not to be named) - he has both the Tucker and Omnipole brush. I had a go with both and can say for sure that the Omnipole is useless.
Nowhere near as soft and useable as the tucker, a lot heavier and @ £36+VAT, sorry Glyn, I'm not buying it.
The tucker on the other hand was good, it was light, the bristles splayed nicely and it seemed to glide over the glass. Is it worth £50? I think it may be. We use salmon brushes, they're 11" long and light as a feather, the only problem is they have a tendency to curl up (the bristles) and can be a little too soft. Ordered a couple of Ionics brushes today so I will report back my findings on them, the 2 Ionics brushes cost less than 1 Tucker!