On top of all that's been said here, I like my zubat better because it is a beefier blade. I have never had one buckle in a cut if it got jammed. I have never broken one (not a challenge--I am sure someone could). When I am using my silky, the cut is smoother and more comfortable because there is less vibration from flex in the blade. Coronas and Fannos do the job, but silkys are nicer to use, cut after cut. I use my handsaw for probably 85% of my work. It's worth it to me to make that work a little smoother and easier.
I use the same philosophy as with my saddle. I could get a $80 saddle and it would allow me to do my job. But for $250, I can get a saddle that makes my climbs more comfortable and enjoyable, day after day. Even if the expensive saddle wears out just as fast as the cheap one, it is worth it to me because I'm going to be hanging in it a lot. Over a few years, the prorated price is not that much.
As for the hook on the tip (blunt on the zubat, but with an edge on some saws), I didn't like it when I first got one. I've found it's nice to have, though. When I'm finishing a cut, I can just plan to let the tip hit another branch. Because of the blunt end, it won't damage the tree and I can be a little more aggressive in the final strokes (Yeah, I know, that's what she said). But if I really didn't like the hook, I would grind it off and use my silky without it, because it is worth a little trouble.
If you do decide to switch, it's worth thinking ahead about what you plan to use the saw for. I have a "Tree Tiger" as well as a zubat, but I only carry it on removals. When pruning, I want a nice, clean cut. The more aggresive teeth on the Sugoi do not deliver the same precision as the zubat.
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