Sounds like you met your match
Hmm, no. The shape is totally different and kind a pointy on both sides, not the kind of shape that attracts my liking, I would rather wanna stay in the rectangular realm, including the inverted pyramid stacked with rectangularly shaped amps.
Now if you want a perfect stack cough..cough, the RSA intruder and the DX50 are both perfect pair, I don't stack both as portable because the Intruder is still a heavy amp even though it is constructed with light material, the battery is the guilty party, also it will last about 7 hours of play, not an issue on your regular commute but could be a killer on an intercontinental flight. Would be just fine on a company electrical grid though. . Here we go I said my piece.