Hi folks.

So... I'm close to pressing the button on New P-series to replace my old but great condition Planet X Stealth.
(Thanks to Eric on the sizing advice).

I'm not at the pointy end of racing.
Circa 6hrs for an IM bike leg (assuming its a real full length with 2 or 3 thousand feet climb and plenty of corners / junctions and typical shiiite road surfaces in the UK. So a 30kph average. Steady pacing so I'm not damaged for the 26mile shuffle after.

I defo see the benefits of disc brakes where I live / weather (and interchangeability with road bike wheels). That's not up for debate !!

Wider tyres + tubeless on a new bike. Good. Though I could always get some slightly bigger new aero wheels into the frame and go tubeless.

Internal cables (less drag but worse to maintain!).

I'm comfy enough on the Planet X.
But my position is at a limit of adjustment as the saddle is as forward as possible on a long Adamo saddle (the Stealth seat post is 76 degree - not as steep as modern bikes).
Has a newer PD cockpit not the original Planet X one, so is pretty adjustable.

So - what is the expectation on benefits , before I pull the trigger ? (some good Black Friday deals here - 30% off on a 105 build and 25% on mech ultegra. I'll be sticking to mechanical not di2).

(Other than new bike day is always nice ! and the spend helps the ruined economy just a little).

Or do I drop half the ££ and go get better new wheels for the planet X.

Thanks all.