The problem with Canaan is that they dont move forward. A year have passed and the latest model is still 741.
If you go check out the Avalon thread you will see that there are some pretty heavy teasers that have been dropped in regards to the A8 series being rolled out Q1/Q2 of next year.
Not fuzzy has the link just a few posts up.
I was going to order from Bitmain at one point but it became a huge waiting game, and a headache and a half to try and get an order in. This was months ago and I haven't looked back, since getting my Avalons.