I was sitting to play the bass for decades, but the first time I was shown the angled endpin, I took to it like a fish to water and never looked back. If anything was most impressive, it was being able to play a good Mozart spiccato with German bow for the first time. There was no adjustment to the new position required, as it relieved my inherent position problems with sitting. It immediately allowed me to improve my playing dramatically, and my bass did sound better once it was drilled. Results vary with the size and shape of you and your bass. Some very tall players do not find it to be an advantage, for example. The angled endpin setup is not new; there is a 16th-century bass here:
http://www.khm.at/en/collections/col...l-instruments/ thus equipped.