Having now spent about 3 hours with my new LongStar 2 kites on ovals using both my Peter Lynn F Lyn and Sysmic S2 buggies, I thought I should add to @jhn.holgate's review. Note that flying on ovals means I have executed a large number of turns but not had any "park and ride" experience yet.
I have mainly flown the 7.5m because winds have not been strong enough for the 3.5m. However, I have static flown the smaller kite and used it to cruise slowly in the Sysmic!
The 7.5m behaves just as well as the 5.5m. It wants to take off and only a slight pull on the bar sees the kite soar to the zenith. It builds power with apparent wind and to use John's terminology, is a grunty kite. In fact on one occasion with gusty winds I felt over powered. The 7.5m pulls like a truck when you get going. It is very fast to turn and can spin on its centrally located white Star. As others have mentioned, you need to depower and sheet out on turning otherwise there is a tendency for the kite to stall. Pushing the bar out quickly rectifies this. I have not experienced any flapping on the 7.5m but did get some trailing edge flapping on the 3.5m. I have already commented on the new bar in the General section thread. The kite colours look vibrant in the sky.
I have not really had enough flying time to comment on the 3.5m, but I can say that it is just as well constructed and is very responsive. Even in winds around 8 to 12 knots, it just zips around the wind window extremely quickly! There is not much power in the low winds I have had so far but I am excited and looking forward to using the 3.5m in stronger winds. More to follow.
Here are some photos on the ground. Sorry I do not have a GoPro but will try and get my wife to come out and take some action photos in the future. Some of you will comment on the number of bridle lines but so far this has not been an issue. I like the colored line loops under the leading edge to secure the 4 lines when packing the kite. This prevents any line snagging problems.
These are great Kites and I am very happy with my purchase. Extremely good service from Born Kites keeping me informed of my order by email. They arrived very well packed and protected in cardboard boxes. A truly customer focused first class service.