Well, from a DYE sponsored player. My loyalties will clearly lie with the Rotor. However, i have been sponsored by Virtue and have played with the Spire. It was very good yes, small, tight and performed 'ok' But with the option to set sensitivity etc, it made life a little bit too complicated. I had instances of it not feeding when i needed it. (Being an aggitated feeder and not constant) It has it's pros and cons. But, without unbias, the Rotor has been at the forefront of loader design since its creation. It has been in virtually everybody's kitbag at one time and only biased haters will hate on it. It might be slightly bigger and heavier than the spire. But not by much. However, it's simplicity and bomb proof operation means it is a top end loader with low end ease of use. For me, i would choose the Rotor. due to it never letting me down, easy to strip, performs flawlessly with any ball, under any conditon and feeds a constant stream allowing consistent shooting lanes.