Personally, I'm kind of old school to begin with, so I'm biased, but I own an early 70's vintage 35E and love it. I would generally consider it to be a medium-powered springer: before the R1 and the FWB124, this was one of the higher-powered guns around, but its short stroke limited the power. The R1 took the same diameter piston and gave it a much longer stroke to make a much more powerful gun. But the relatively heavy weight of the 35, coupled with that very short stroke, make for a very smooth shooting gun. Disclaimer - I haven't shot a stock one. Mine has been tuned (I wish I knew by who, because it is a fantastic tune) and is shooting only about 8-9 fpe, but shoots with a "tud," smooth as can be - shots go off even more smoothly than from my HW30. The barrel latch is a little annoying until you get used to it - then it's really easy, and there is no need to slap the barrel open to cock.
Others are welcome to disagree with me, but I view the HW35 as a heavier, smoother shooting, much nicer looking alternative to the modern HW50. Power levels are in the same ballpark, but that's about it. To me, all those things are positives. Even the new ones still exude an old-school, classic vibe with their long, pencil barrel, the infamous barrel latch, and a piece of walnut lumber.