I have a pair of cdj 20 that I use for 1 year, although it is still basic to platinum, it is however ideal for aprendre to mix, I have friends who are double-platinum in Gemini are much more slow and fragile. The advantage of these decks is their speed, even if sometimes it crashes when it very promptly so far been very loyal for a very affordable price.
I still search for other decks because the only thing really missing these decks is a loop.