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Probably. The metal feet look cool, the rubber is more practical.
i have those same metal feet on my Aristaeus; and they are nicely done. so far i've just used those and not experimented with other footers.
i would be very surprised if the rubber feet are the highest performance approach, although they do make things easy and less hassel. i expect rubber feet would cause a bit of image blur and loss of bass articulation and transient snap.
why would one pay big money for state of the art gear, and then not optimize the environment for that gear when it is pretty easy to do. any tubed amps are very susceptable to footers and racks......you cannot judge the level of musical focus without trying different footers. since these amps are relatively lightweight, it also may turn out to sound better with a bit of mass loading.
typically either grounding (with spikes and a solid rack), or de-coupling are the two choices. it likely depends on the rack they are set on, and the floor beneath that rack (or even the type of building you are in).
i use Wave Kinetics A10-U8 de-coupling footers throughout my system ( i own 8 sets of 4), and when the BHSE arrives i will be trying both the BHSE and the Aristaeus with those de-coupling footers. spikes may end up being better, i'll have to listen to find out.
http://wavekinetics.com/a10-u8.html
obviously, these kind of choices are personal decisions, and everyone has their own approach and even sonic taste to consider. YMMV.