Jim, Roger has a HQ 2m Graphic Delta with a HQ 3m Delta Graphic Rainbow in the post to him.
Roger, the attachment points on the 2 and 3m HQ deltas are fine, but I usually add a second knot immediately behind the first. I normally do that before handing them over. A ribbon is used as an attachment point on the 9ft Mylar deltas and I do worry about the durability of that but, so far, Jim and I have not had problems. Unlike the string on the HQ deltas, the ribbon cannot be removed and replaced on the Mylar without stitching.
In the first few years of flying Sleds, I had one spar pop. But I have had several go in the last year, none of which I have repaired as yet.
The attachment point on the Sleds is very good. What you do have to watch out for are the thin vertical spars popping out of the fabric, often loosing their end cap in the process. Sleds must not be flown until the spars are reinserted with an end cap in place. So, although Sleds are easy to fly, they should be handled with care.
i would add that these kites are robust and take quite a bit of rough use. Myself and John test our kites in variable conditions and in extreme cases, to destruction. i would suggest checking your kit over, especially kite seams and kite lines prior to packing for taking in the field. like most things in life, a system is only as strong as the weakest link, check the known regularly.
Give someone the reel and pull out about 20 metres, or more, of the line in the direction that the wind is blowing. If you are flying solo, it is helpful to use a ground stake: www.armadale.org.uk/snaps.htm#May or some other attachment point.
Attach the kite to the line, then pull the line taut and launch the kite into the air whilst stood behind it, so as not to interrupt air flow.