Nathan from oxbridge sent me a sample of the magna (cheap) and the windsor (middle) - the top range will compete with the kooka turf (his words, not mine) but is yet to hit the market.
Magna: Ok shape retention, but gets soft after 20 some overs, swings alright, slightly hard on the bat, but not bat breakers. (Ok for 20/20, or 4 balls a match 40/50 overs at lower levels)
Windsor: Superb shape retention, swings through 50 overs, lovely sound and feel off the bat. Cannot recommend highly enough. (had to go though 6 hours of sessions before it started to go soft)
Looking forward to the top of the line - hopefully arriving in a couple of weeks.