I saw the knife at REI and ignored it because of the handle but the salesman got it out for me anyway.
The dagger blade on the 530, wasn't for cutting & slicing, Benchmade fixed that with the 531.
That left me wondering why they didn't design the handle to better match the new blade shape.
I was waiting to see if the 535 had the same action as the 530/531. Both of these have a notch in the tang, under the piviot where the Axis Bar sits in when the blade is closed. This keeps the blade in the handle until you pull back the Axis Bar, which also pops the blade out of the handle making it easly to flick you wrist slightly and the blade is open.
I noticed that and normally I would reject a knife with any assist feature. I'm one of those who always either just rolls the blade out with the stud or pinches it open. It's a personal preference but I like having control over the blade.
I will carry it tip down in my small Benchmade belt pouch. So I can ignore that feature.
A Leek opened in my pocket one time, sold it ASAP. A knife should not need a lock to stay closed. Regardless of how it is carried.
I'm aware it may suffer an irreversible loss of collector value. As long as it works better for me, that's the point of any modification. I agree with scott, very slow and easy is the way to go when making these changes. Do each change one at a time and leave a little more material than you think you want to remove. Then use it for a few days. You can always remove more material later.
Maybe Benchmade will take notice and fix the handle.
The major change to the back could be done with out interfering with the clip.