Having worked with PLA and ABS exclusively so far on the FT-5 I can agree with what Walter said wholeheartedly.
When using PLA I can definitely see a need for a cooler fan and nozzle (sagging, top layer quality).
I just haven't gotten around to printing one (I'm having too much fun doing other prints).
But for ABS, I can also see the need for side and top covers to stop drafts and wouldn't want to use a cooler.
Warpage and lifting off the bed (even when heated to 95C) have been significant issues for me on parts that have larger X-Y spans.
Again, I'll get around to adding them, but all in good time.