I have 3 versions of the B-Series and have found that the Mid-Vent gets flown the most.
It does give up something at each end of the wind scale compared to the Full Sail and Vented, but it has been pure enjoyment in the range in between.
I would recommend a set of Race Rods and 4 Wrap Equipped, along with 50# light wind lines and 90# lines for maximum wind range.
If the winds are smooth and steady, the Full Sail definitely has the low wind advantage, but I've found that the Mid-Vent handles light and turbulent winds with more control. The Full Sail can be sensitive to poor winds and can tend to luff, where the Mid-Vent filters out a lot of the swirls and gusts and flies smoother in the bumpy stuff.
There are no free lunches- if you gain something at one end, you lose something else at another. The Full Vent can be slightly 'mushy' at times, where the Full Sail can be a bit 'skittish'. The venting filters out a lot of minor over-corrections and bumps in the wind, giving it a smooth and forgiving flight style. You do lose some of the Full Sail's quick response and tighter feel though.
IMO, the Mid-Vent is the best of both worlds. It keeps most of the strongest points of both models while not giving up too much at ether end.
disclaimer: I'm just a guy who likes to fly kites. An Expert wouldn't have the same limitations as I do.
