The keychain loop on the Mako scares me. That's the same kind of keychain my Quark Mini123 has, and it snapped clean off after just a couple days of carrying the Mini on my keychain. I thought I lost the light, but I tracked it down next to the seat in my car. I am afraid a Mako with that same kind of loop would have the same fate befall it. The Sapphire et al have much more secure looking keychain loops.
Did you have the Quark connected directly to your keyring without another split-ring or split-ring/swivel? If so I could see how it would brake on an aluminum light. I would never connect it directly to my key ring for several reasons, but I think the Ti Mako would hold up if one did.
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Other thoughts.... the main advantage the Mako has over my Aeon is that it uses a standard cell. Second possible advantage is the slimmer, but longer, format, but I'm not sure this is an advantage or would be for everyone. The third seems to be that in Titanium it is much less expansive than the Aeon, not sure why this is, but I can see the titanium shell being a clear advantage over the Aeon, which means it has a price advantage since the Aeon can also be purchased in titanium.
So it seems that if I carried a few backup cells (I could carry 2 instead of 1), and since I'm not doing much travelling, that the Aeon is maybe a better keychain light than the Mako. The Aeon I think has the advantage of the larger reflector and nicer beam, although since I've not put the two side by side I can't say for sure. It would just cost more to get it in Ti, or I could live with HA.