Even from one brand you can have easily boiling glass (even on HH), shocky glass and very friendly glass, soft or stiff, demonstrating "devit" or not. For CIM you can read the testers reviews at CIM official page, for each single color. For Effetre you can search here for each individual color (and transparent/pastel/opalino/alabaster/handmade after color) and you'll find tons of invaluable information. For Reichenbach as well.
If you search on "by color" basis you'll get more detailed information than for a brand in general.
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