So I'm luckily borrowing a Susvara and He1000SE and i'm quite surprised. I'm finding some things I expected based on reading reviews and posts simply not to be so.
1. The Susvara aren't nearly as bad to drive as folks make them out to be. I'm not pushing 100db volume, but am listening at healthy levels to rock, pop, classical and other more demanding music. I've tried various amps Pathos Aurium ( volume @50% - with a external 100w linear power supply from China but upgraded w/ supertech slit foil caps and IXYS rectifier), Burson 160 (volume @40% pre production demo with some oddities / differences from production - no idea its actual power), Bryston BP-25 (volume @ 60% with the old PSR power supply but with MUR860 rectifiers) and even a Chord Mojo 2 (Volume @75%). They all sound different but none is running out of steam. The Chord comes close, though. And to be clear... I def do know what running out of steam and clipping is... I've tried (and failed) to run a 8 watt SET amp on somewhat inefficient speakers in a medium room...I thought maybe jazz, but alas no. Also, I should add that while I mention volume level above, thats more about gain than it is power... but again none are clipping and I do know what that sounds like. I will try to find a more powerful headphone amp to test with, just to compare and make sure i'm not missing something.
2. The Susvara is FAR better than the 1000SE, timbre, depth, imaging and even bass. Sadly, I don't agree with what some say that the 1000se is 90% or a baby Susvara. I actually found that while folks say the 1000se is easier to drive (obviously!), it's more picky with amps b/c any tiny bit of glare and it shows up. The 1000SE is still very good, to be clear, but its no Susvara. I make this point though, b/c some folks seem to say get the 1000SE and save money on amps. I'm finding so far that the Susvara has synergy with more amps. Even the inexpensive Chord Mojo 2, and the built in headphone out of the BP-25 sound great, and have adequate power. I think, at least right now I'd rather have the Susvara with a modestly priced amp than the 1000se with a fancy amp.
3. The pads needed some massaging to get the foam to lay flat within the fabric and leather. Sound was a lot better once fixed. Why are HifiMan ear pads and cables so bad? My old Ediiton X flaked apart... and I did not even bother using the stock cables on the 1000se or Susvara... the stock cables remind me of the air lines from when I had a fish tank. At least they don't stink like the tank did? Oh well, the headphones sound amazing and are very comfortable.
4. Folks may say its silly to compare the 1000SE to the Susvara... BUT while there is a large (MASSIVE) delta in MSRP, on the used market it seems like Susvara go for about ~3500 and the 1000SE for about 2200. Real. Serious. Money for both. Neither is a budget purchase, clearly.
I plan to do a review after I've spent some more time comparing, and will post that up. If anyone has recommendations or things I should pay attention to let me know!