That works very well. I'm using a Sony eBook Reader, now 10 years old, and transfer was straightforward using Calibre. Download was quick - about 15 secs - but Calibre's preparation for first read took a while. About 8 minutes on my AMD Ryzen 5 5600G, pushing the CPU to 55%.

Transfer to the Sony was quick, giving me a book of 13,400 pages. Selection via the alphabetical index is fine and the search function is effective but very slow - about 2 mins to find "four green". Not surprising with 13,400 pages!

The sheet music images are a bit small but I would rarely want those.

I will find this useful. As you say, most people will have access to the DT via their phones, but I don't use the browser on my phone. The place away from home where I'm most likely to want to refer to the DT is our caravan, where the mobile phone signal is intermittent at best - texts generally get through in half an hour or so and I usually know there's a voice call and can go up the dune to respond.

I can't help with Kindle. I rejected it 10 years ago - I don't like locked-in proprietary hardware.

Phil