The print bed could be better, I found that the buildtak type surface gets ruined too quickly, I removed it entirely and replaced with glass and normally use blue painters tape on top.
The first 5 minutes are critical for this printer, there is the occasional bit of over extrusion which will pull off or interfere with the first couple of layers, which will cause the print to fail.
It takes proprietary spools with no mounting points for 3rd party filament, this is easily worked around but annoying all the same.
The included software is a bit rubbish and I found I got an unacceptable level of failed prints using it, I've switched to simplify3D now which is worth the price.
Dual extrusion has turned out to be a bit of waste of money, but thats just my opinion, there are too many quirks and compromises when dual extruding.
Don't be put off by these negatives though, I have had other printers and this one is great overall, I would recommend it and I will buy another Flashforge in the future, I'd give it 4 stars overall.