Chains wear out so buying the most expensive chain adds to the maintenance cost. Ultegra chains run smooth and shift very well with only a few grams added to the weight. Cleaning and lubing will always be the most important factor in chain performance.
I have own this pump for 7 years. Pump is efficient and the pressure gauge is at the top where it should be. A couple of times the adapter the has worn out with threaded values destroying it on the inside. Call the manufacturer and they will ship you a new one for free.
I do like the thinness of this headband, but it does not perform as described. On hot summer days the head band does not prevent sweat going in your eyes. There are cheaper options that perform just as well.
This cassette offers many different sizes for different terrains. I use a 12x23 on the flat roads where I live and a 11x25 when I travel to the mountains. The shifting is excellent and the price point allows you to replace the cassette as it wears out without breaking the bank.