That TS-9002 looks quite interesting, and sports an uncanny resemblance to the Marantz HP101. Thanks for introducing us to what seems like yet another great phone from Fischer.
Not seeing the Marantz for sale anywhere in the US though I've definitely heard the HP101 name before (just never saw what they looked like). There's also a Kanen model (thanks, jant) with the same housings but I'm not seeing that anywhere either. It'll probably be cheaper than the Fischers if it surfaces but as for the sound - who knows.
The Marantz HP101 would certainly be an earphone you should review. Been around for a while tbh, but still rather unknown. I can easily buy it here but go other commitments money wise I've afraid lols.
Just out of curiosity, what's it cost?
Small note: The Denon C700 benefited going to a bi-flange tip. I might suggest you try that out with the C710 as well. It helps get rid of the midbass and treble bumps and flattens out the response. A foam tip can help with this too. The small single flange tip just isn't a good choice for the C700 and it may not be for the C710 either.
The C700 is a straight housing IIRC so that might work with bi-flanges, but the angled C710s really don't, at least not for me. Deep-fitting tips make them intrusive and they're a bit heavy and not exactly flush with my ears in the first place. Comply T(x)400s worked great but of course just add extra cost to the earphones in the long run. UE singles worked fine for me - the Denon stock tips seemed a little less soft/flexible. The treble really isn't offensive - not in the way something like the Grado iGi is.