I was surprised too. All reports here seemed to confirm that this wasn't an issue on the H20.
Thanks for the heads up re the earlier device. I'll have a scout around the earlier models to see if I can be tempted back into the fold, but I'm kind of sceptical...
The idea of getting a Kobo was really a back up plan for whenever (if) Amazon withdraw support for the early version of Kindle for PC/Mac (still compatible with Calibre). I never had any complaints about the Kindle screen resolution or lighting, but then I saw the larger H20 screen with its adjustable light tone and fancied upgrading.
Consumerism red in tooth & claw

I appreciate your input. Thanks.