got both, I like the Spire, as it`s new and seems as though it has a lower profile but that is at the front only, I also like the Rotor,and with this I`ve been caught out during a match throwing in duff balls creating a problem to shoot, opened up quickly and dumped the balls, a quick look and feel then reloaded, It was very very easy, the Batteries last longer than a Spire, both are flat topped for easy loading, and I use a lid on both, If I was to be in a contest to find out how quick I was to load, I`d choose the Rotor, maybe it`s because I can get the lid open faster ha ha ha I don`t know but yeah I think I prefer the Rotor, and it`s cheaper !! Not had any Problems with either. . . Yet !!