Was thinking of getting one and was wanting to know if anyone out there has had any experience with these. Thanks

I'll take this as a NO to quick fuel. Must be junk.

I put one on a mildly built 360 small block. fired right up, idles and performs great. Have not gotten into any tuning (Jets etc.) as it runs so good i'm not sure it will need much. I only adjusted the airfuel mixture and choke settings and my car runs great no complaints. a little pricey yet I feel I got what I payed for and happy with how it performs. I'll check the plugs once i get a few more miles on it. directions that came with the carb said to cruise along at 3000 RPM's and see if it "surges" I have felt nothing like that. It mentions if it surges it may need some jetting work

""I'll take this as a NO to quick fuel. Must be junk.""

Junk, not a chance!!

The Super Street models are fairly new from QF (released this past Fall). This might be why you only have had one other member reply.
I opted for the Super Street 750 DP-AN (735cfm annular, electric choke) which shares some parts with the 680 VS unit. They are very nice units!!
The QF tech group is top notch and they cast/machine allot of the pieces on these carbs themselves.

What jets does the 680 come with?