I have a GT-10B, bought a loooong time ago, and a pedalboard with 3 single effect pedals.
Back when I bought the GT-10B I remember strongly disliking the tone and especially the complication of having to configure different patches with a metric ton of different effects and compressor types, drive types, preamp types, etc. Used it for a month, tried to sell it, and when I've failed to sell, I just put it in the box and left it collecting dust.
Last year, I came back from a long hiatus. Now that I need to play with headphones thanks to neighbors, I decided to take the GT-10 off the box and play with it a little.
After 10 or so years I finally began to appreciate the pedal. It is damn convenient, has everything you'll possibly need in terms of effects and utilities (recording, playing with background audio, etc) and with modern tools (hello GT-10B Floorboard), you can configure a usable patch in seconds, rather than minutes. Right now, it is a pedal that I don't think I'll ever sell simply because of its convenience.
However, the truth is that every single effect on it is objectively worse than my other pedals. My compressor is better than the GT-10 ones. My preamp is better. My drive is better (hell, Boss ODB-3 drive is better than the GT-10). It's not that the GT-10B is bad; the analogs are just too good.
My advice on this is: as a rule of thumb, analog pedals are simply better. However, if you are not picky with quality, have/need a stupid amount of effects, or simply wants a single pedal to control everything, then it is very cost effective and overall decent.