Anyone use or have experience of them? Looking at the Rider 35E in particular as I’ve seen a very nice deal – never heard of the brand before though

I had the Bryton 35T – the same unit but with HRM and cadence unit. I upgraded to the mapping version.
But I can highly recommend it. It has a largish screen with configurable data fields, compatible with ANT+ power meters, basic non-mapping route facility and a multitude of training modes.
The uploading of data goes via their own website but all data can be exported to TCX, GPX etc files and subsequently loaded into Strava or elsewhere.
I would recommend the 35T over the 35E as the additional outlay for the cadence and HRM are worth it – compared to buying seperately.
Merlincycles appear to have them for £160.

£114 for the T on sportpursuit.com just now! 70 something for the E. Might just have to treat myself I reckon

That is an amazing bargain!

(I’d use the cadence unit for road work or turbo trainer only)