I do not think anything aprt from an e bike will make me faster, it is just the point of how good is it for shifting and once set up runs smoothly, like I said its not much dearer than mechanical but you have answered part my question by stating that it is a marvel of applied engineering and reliable, that is the way of how I am leaning towards it,I know it will not make me any faster, cheers
High quality wheels will make you go faster, deliver more comfort and greater stability when cornering. I think it's worth 2+ mph on the flat, climbing is easier and around 5+ mph descending.
Last year I was training for the 312 and had been having a lot of dialogue with my LBS about this. I wandered in one day and the owner said "I know how we can make you go faster." Went out the back, returned to hand me a pair of carbon tubeless wheels. With tyres it cost me +/-£650.
I did this on trust. The improvement is very significant.
I wouldn't dream of telling you how to spend your cash. However Di2 will deliver pleasure and a smoother change. New wheels will deliver improved performance all round and a smoother more comfortable ride. That's my pleasure!
For me it's a no brainer.
Does the £150/200 you quote include shifters etc?