I forgot to report, that I finished Daitoshokan no Hitsujikai (console version - including spinoff and FD) around a week ago
Overally it was very enjoyable read. With 40 endings and 90k lines it took some time, but I almost never felt bored - this VN created nice environment, where it was just enjoyable to spend time with the characters.
Yeah, after finishing whole game I stand by that opinion
I also still find the amount of event CGs not enough - but that's a minor gripe.
As for "True routes", I think the naming might be a bit misleading. There is just one true route, and main heroine of that route is Nagi - but it also has optional branches for other girls. However, I'd treat that as an extra, since those endings aren't as fleshed out as the "normal" routes for the girls.
I'd also like to mention the console-exclusive route for new character - Kingyo. It was great, among the best routes in the whole game That's the second (or even third) time I encountered that phenomenon - the other one being Wakaba's route from Tenshin Ranman, (and perhaps also Chihiro from Kono Aozora ni Yakusoku o).
FanDisc provides very nice supplement for each heroine. And spinoff Houkago Shippo Days is just a nice short mini-VN in the same setting. Nothing great, but I liked it nevertheless.
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And currently I'm reading perhaps the most random VN so far - You & I. It's the last title by JAST/Tiare (best known for Sakura no Kisetsu, Meisou Toshi etc). It's also their first VN that ditched the command-based adventure game system, and went with Ikura GDL engine (Crescendo, Kazoku Keikaku, Yukizakura etc).
This title got released in June 1999, so it's as old as Kanon. But the writing is more in-line with Sakura no Kisetsu So far it seems to be very generic old-school charage, but for some weird reason I'm enjoying it