What are the key upgrades or modifications that owners of the Orbea Ordu M30 have made to take their bike to the next level in terms of performance, comfort, and overall riding experience, and how have these upgrades impacted their training and racing results. Are there any specific components or accessories that have proven to be game-changers for this particular model, and what are the trade-offs in terms of weight, aerodynamics, and cost. How do these upgrades align with the bikes design philosophy and intended use, and are there any potential pitfalls or compatibility issues that owners should be aware of when making modifications.