I have ordered 7 custom putters from Bettinardi, as well as owned gallery/tour putters from Cameron (009), Olson (retro blade), Artisan (0117), and Swag (Suave 2 - from Don't Give a Putt).
I don't think anyone truly offers a "great custom experience." Prices are through the roof, with limited options for what they cull "unlimited custom experience," lead times are often 3x of what quoted (but that's the golf industry as a whole right now).
As others have mentioned in this thread, and with my experience, I don't think getting a custom is a good option. Once you get it, you always see another one and think, "I wish I would have done that" and instantly lose the appeal of your current wand and want something different.
I think the best option is staying patient for something that checks "most" of the boxes, and adjust to your specs.
Let's be honest, we will never be fully satisfied with a putter.