Clone bricks are a disgrace to humanity, and all of them should be destroyed.
I love my clones!!!
My story is full of clones - they make AMAZING enemies to all that is right and good and Lego...!
They also have some unique pieces and designs... I'll keep my clones forever... BUT I will NOT mix them with my Lego pieces... no way! Label me a blockist if you must!
I have to say that clones are a nightmare to work with... if not for story writing I would never buy them and I would never buy them for a child!! Many of them are dangerous!
The bricks do not actually fit together in many cases - so that if you move the model entire walls will collapse. The figs have hands that fall out of the arm at the slightest touch. The helmets do not fit on the heads of the figs all the way, looking like the fig is wearing a top-hat of sorts.
One exception is Oxford, from Korea. Their Chinese/Korean themed sets are pretty good and the pieces are higher quality.
I would never mix them with my Lego though~