OSM is also available for less than a fiver, and I'd prefer this over OS for small screen clarity (and I have the whole of the UK OS on my phone in ViewRanger anyway). The pricing is comparable with the Mio 315 (with their locked down mapping) and far from outrageous when compared to Garmin. Wahoo have the Element out soon at £280 for a black and white screen. Incidentally, over at cyclogps.com it's reported that Mio/Magellan has lost a key number of its skill-workers who developed the Cyclo range and it may well have reached the end of the road, so to speak.