Kev,
I use the TomTom Rider. It's cheaper than the Garmin, but I suppose you get what you pay for. The mount is only ok, and apparently prone to letting the Rider fall out (although this hasn't happened to me), and the contacts are also exposed to the elements, so rain can short it out, if it's wired to be "always on". Touratech do a mount for it too, but I resent having to pay extra for that. The on/off switch is a pain in the ass to use (hence the need to hardwire it to to the bike using the mount). I don't like the software much either.. they didn't seem to think about how to make the common tasks more easy to access (like adding the current location as a POI / favourite).
On the plus side, its a lot cheaper than the Garmin (or was, when I got mine), is handy to remove and stick in your pocket, easily used with gloves for the most part, and you can disable the "safety" feature that locks down most of the functionality once moving (by isolating the second pin from the left, viewed from the rear). The map coverage is good (at least for UK, EU), but absolutely terrible for Ireland.. my home town, for example, which has a University, appears as though the main road ends in a field. Outside the pale, the entire country looks like one great big field!
On the neg side again.. it's not IPX certified waterproof, but I haven't seen any issues with that. There are no speakers or audio output, just a fiddly bluetooth contraption that breaks / gets lost after a week in the wild. They should also give u a car charger for the bluetooth headset, but don't, so you have to charge that with a mains adapter (where, exactly??).
GPS-wise, it's quite accurate, picks up a signal within about 3 seconds of coming out of a tunnel, for example, and uses the latest generation GPS chipset. Even when it loses the signal (in tunnels, for example), it keeps a fairly good track of you.. I think it has an accelerometer built in for this purpose. It takes a standard SD card, so you can clone / backup your SD cards in case something goes wrong. It runs Linux, and there's even a software developers kit for it!
I use it mainly for postcode navigation in cities like London. I'm not sure how much I'd use it out on the open road yet. I'll find out in about 3 weeks though, when I take it to Greece, Bulgaria, Romania, Hungary, etc.
I hope this helps. It all sounds very negative, now that I re-read it, but I actually like the Rider a lot. I'm just emphasising its weaknesses, so that you're aware of them.
Colm
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