The bike mount is excellent and can be angled for stem or bar mounting (I've got mine on the stem)
The 1:50k mapping is good and works well for the majority of rides. I managed to get the North of England and Southern Scotland cards for only £70 for the pair one from Ebay and the other from Sport Direct on sale.
I've also got one 1:25k card for an area where a lot of the rides are on moorland where the extra detail of the Explorer mapping is of benefit to check field boundary positions is of use. Satmap have 30% off the 1:25k maps online in their store until mid July. I think I'll take up the offer for my locality.
It's worth keeping an eye on ebay as a fair few cards come up for sale on there.