The big companies products are not any more "built for longevity" than anything else on the market these days. Unless you are buying high speed, high end equipment (gearless, high speed, high capacity).
That said, I agree that you have a good relation and a good track record with your current service provider, it only makes sense to keep this strong relationship going. IMO it is the companies labour pool and approach to business that makes the true difference. Find a provider that cares about the customer and you will have a winner.
