Hi. I've had 2 Tom Toms and a Strike. All sold as motorbike models. I will never buy anything Tom Tom again. The warranty does not exist. And I found the Strike to be just "all too hard". What works best and economical is: I have a car Garmin Nuvi, about $110, and on eBay there are Motorbike Jackets available for around $28. And I mount this configuration with a RAM Mount to the centre of my handlebars and power from the 12 volt power outlet. Map Updates so far have been all free from Garmin. Great!!!!
Now the downside. The touch screen is hampered by the Jacket and our gloves. And the configuration is not waterproof and if rain starts whilst riding the jacket fogs up pretty quick.
All is not lost. What I do and I am happy to do it. Start the bike, and before riding off, I key in my destination on the Garmin and I carefully put the GPS back in the Jacket. Don't touch the screen again as the Garmin will do its own thing and ask for more instructions. The Garmin will happily run on our Power Outlet and it displays a real Speed across the Ground. Great for checking my speed at Red Light Cameras, School Zones etc.
At end of section when stopped I can estimate the next rides distance etc. And if it looks like heavy rain I can put the Garmin away at anytime and keep it dry.
Another option is to only use the Garmin if looking for fuel, hotels, addresses etc when you get to a city or town. All up about $150 and Garmin warranty and service does exist. Hope this helps.