For How Long Is Deadeye Good?

At level 45, I started using Deadeye, being interested in its Major ID after hearing very good things about it. At its level, it can shred pretty much anything with only a couple spells. Now I'm level 65 and it's still stupidly strong, enemies almost always dying after a single spell. So for how long (up to what level) is Deadeye a viable weapon? I've tried to construct a build with a different weapon (it's just Morph with Spectral Slingshot, don't judge) and found said build to have better damage output, though by a relatively small margin, discounting the DPS difference as Hawkeye can be cast faster, thus it having more of it. At this rate I feel like I could be using Deadeye all the way until I get Nighthawk.
In case it's important to know, this is my current build.

 

You could definitely use it until endgame, carried by the major id!

I'd definitely replace it with something like Maelstrom/Corrupted Witherheads/etc at 70(+), maybe with clairvoyance earlier