I arranged a six-day/five-night trip with Hut to Hut Slovenia. It's the first time I've gone with a tour organizer and I can say it went really well. In the past I've arranged huts myself and it is a huge hassle figuring out how to make the bookings, if the bookings actually exist, and what good/viable routes might be. Having this all sort was, at least to me, totally worth it.
The routing is via Ride with GPS, which was great. I'd recommend bringing 1:25,000 scale paper maps as a backup, just in case.
The huts themselves differ wildly. Some are really rustic with, ahem, interesting toilet facilities. One was accessible by road and thus had showers, a long menu, and even espresso. All will have some sort of food, but you might only have two options for dinner (one with meat, one vegetarian). The cuisine in the Slovenian huts leans strongly to stews and goulashes with minimal fresh vegetables and/or fruit. Certainly good and hearty but pretty much everyone I talked to said the food was better in the Italian and Austrian huts. Some huts are cash only, some take cards (but the card reader might be down). A 1.5 litre bottle of water is about 6 euro, so if you have a beer with dinner and also buy lunch you need to carry about 25-30 euro per day in cash (assuming you have a booking that includes breakfast).
Of the six days of hiking, four were ridiculously spectacular, with the highlight being sunrise from Mt Stol. Getting up to the high mountains, though, can be crazy steep, with switchbacks only sparsely used. Descents are similarly tough, and you have to watch every step. For the first time ever I used trekking poles and my knees thank me. Two days were a bit of a slog, but this is probably unavoidable getting up to or down from the high terrain.
Would I do something like this again? Yes, absolutely! But next time it will probably be the Dolomites.