We’ve (as in myself and our team guys) have done a lot of testing with the Checkpoint teardowns, it’s a freaking rocket!!!! By far the most powerful teardown we’ve come across…. Comm and brush were are great as well, you can get 5 runs on a 7 turn with 18* of timing, NO PROBLEM, if less timing was used (say 12*) I could see 8 runs being possible before maintenance is required…. That’s my honest unbiased opinion.
As for their armatures going out of balance, can’t say for certain as we used our arms in their can….. I do know that many manufactures over the past few years have had (and continue to have) problems with their armatures going out of balance. This is not a problem with the quality of blanks from Sagami, but rather the quality of the epoxy and the quality of windings on the armature it’s self.