I bought a new X9 earlier this year a 160 to 210 which I think was last years model. Theres no argument that it is very stiff, however I have had two problems so far
- I broke one of the adjustment clips on the rear of the boom. I did have the boom extended within 10 cm of max adjustment which probably was'nt best practice, and the rig was probably overpowered and I was crashing through chop upwind
- the boom clamp needed replacing as it developed some small cracks, the replacement part for this looks like its is stronger and a different grade of plastic.
Whilst I have to question the quality of this boom for all the $$$$'s I guess the replacement service for any problems was very good. I hear this years models are improved and better, but more $$$$
I've now bought a KA carbon boom for my bigger sails so I wont need to extend any of my booms near the full extension again.
From my reserarch I woukd seriously consider the Maui carbon, and in alloy the Aerons are apparently very good for only a small amount of $$$
Hope this feedback helps