I’ve made a few comments on the FF29 on my own Buzzard or Solaris thread, but I just wanted to address the issue of comfort here.
It’s a hardtail, so virtually all of the cushioning comes from the rear tyre. Any give in the frame probably doesn’t amount to more than the difference of a few psi in the tyres. If you want comfort then run a big tyre at low pressure. If you want more speed on smooth surfaces then pump the tyre up a bit.
After tyres the next biggest effect is the length of the chainstays. The longer they are the less your saddle moves for the same deflection of the rear wheel, which equates to more comfort. At 445mm the chainstays on the FF29 are already a bit longer than is the current fashion.
The longest rides I’ve done on mine are 5-6 hour day rides, but comfort has never really been an issue. Mind you, I’m used to doing that on a road bike with 23mm tyres at 100 psi, so all these off road machines feel pretty plush to me 🙂