Navman 3450 GPS Sleeve with SmartSt Pro V3

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Looking to get a 3450 sleeve (£175) for my old Ipaq 3850. The sleeve comes with Smart St Pro software but you can also use 3d Ordnance Survey maps with it if you end up somewhere remote that's not covered by the SmartSt maps.
What I like is that it is a totally mobile solution with no wires. You can stick it in yr pocket and go hiking with it.
SmartStPro V3, which should be coming out any moment, will enable you to download 3rd party traffic camera databases too.

Any views?