Colin...its great hearing about your foil journey....I remember the early days on Kiteboarder.co.uk....... The older foils were fine - Flysurfer got their act together with the Psycho 3's - around 2006 - I had earlier foils like the psycho 1 - which jumped - went upwind and relaunched and was unstab...
I had an issue - once with the my Sonic 2 - would not inflate - wing tips kept collapsing - re did the mixer - even though it was not off - and since then has been perfect - for me at approx 70 kg the 13 is the biggest kite I will need for a twin tip
In my experience foil kites would start showing signs of age at 100 hours. LEI kites are still going strong at over 200 hours. Funny I have Psycho 3's from 2006 - going strong - the odd replaced bridle - but not much else - my 2009 Fuel with much less hours on it is held together with spinnaker tape
That looks like a Mastair .......if anyone is interested I have a crispy 16 mt Mastair with an untested speed system added by that chap in switzerland - cant remember what it was called now. The Mastair pulls like a truck and is way to powerful for me....but if anyone is interested.