the previous racket i use was a great disappointment. the whole shaft came loose within 2 months and i got to change a brand new one, and it came loose again till i lost faith in it for your info, the shaff did not broke, but it came out from the handle.
I had a cheap Genji racquet come apart exactly the same. I glued it back together with liquid bond thingy and still using it to this day.
I have both C700 and D800. For the $$$ I spend, I think that's a good deal consider both have decent performance and durability. Both rackets fits more toward defensive / all-around type of players, more than aggressive smashers.
