I've had no problems adding the courses to the 25 (just sending fit files to the device via garmin connect seems to work ok). However, with a decent sized route (100km) I was only able to get it to work once on day one. Since then the device has crashed every time I have used the very same course (or any other course) - with no changes between day one (fine) and day 2 (100% crashy).*
I have subsequently resorted to the ridiculous semi-solution of creating a 5 yard route outside my house and following that every time I ride (which doesn't crash - possibly due to the tiny size). This means I get the benefit of the compass pointer (which is unavailable outside of course following!) telling me which direction I'm going - and thus only use it on rides where I pretty much know where I'm headed anyway! It's basically become glorified cycle computer with a compass and a retrospective route uploader...
*I have not retried this yet on the latest firmware (3.0) as my 800 sprang back to life after getting condensation in it, so it has resumed proper course following ride duties for now.
If you're going to return it (and you should if it doesn't work as expected) you should do so within 6 months, otherwise you'll go through the ballache of arguing with the retailer about the Sales of Goods Act and what 'reasonable' means in terms of dealing with bugs.
I've had no problems adding the courses to the 25 (just sending fit files to the device via garmin connect seems to work ok). However, with a decent sized route (100km) I was only able to get it to work once on day one. Since then the device has crashed every time I have used the very same course (or any other course) - with no changes between day one (fine) and day 2 (100% crashy).*
I have subsequently resorted to the ridiculous semi-solution of creating a 5 yard route outside my house and following that every time I ride (which doesn't crash - possibly due to the tiny size). This means I get the benefit of the compass pointer (which is unavailable outside of course following!) telling me which direction I'm going - and thus only use it on rides where I pretty much know where I'm headed anyway! It's basically become glorified cycle computer with a compass and a retrospective route uploader...
*I have not retried this yet on the latest firmware (3.0) as my 800 sprang back to life after getting condensation in it, so it has resumed proper course following ride duties for now.