The main issue I have is that I'm extremely uncomfortable working with this type of thing when large amounts of money are involved. (50 dollars is a large amount of money, when it comes to breaking things or making mistakes.) I want to do as little as possible because it's less that I can screw up.
The C6 looks nice, but I don't like the tailcap switch much; I prefer momentary switches on the side. I know I'm being picky, but that is just that. And I'm not so sure about using a different driver than the ones on DTR's page, and I'm certainly not comfortable setting the current myself.
Regarding the ebay host with tail keyswitch, that is a Laser 301 or LZCS type. Those are my favorite host type from the standpoint of looks and ease of use, but they are designed BADLY; Aixiz modules are not compatible without custom parts and working on them hasn't proven worthwhile. It can be done, but it's a huge pain. These hosts have no heatsinking either, you pretty much need to have a custom part made. That 10-dollar host ends up costing 3 or 4 times as much.
I have three green laser 301's with damaged lenses, just replacing the lenses will require custom parts. Stupid, stupid design that should never have made it off the design board.
I could have another member built one for me, but I already tried that and it didn't go well at all. And I would like to just avoid the shipping, planning, etc. hassles. Not worth it to solicit a build imho, so want to do it myself, but terrified of destroying an expensive part and having to just eat that cost.
edit: I'm not looking to build a burner or anything like that. A 160mW single-mode 635nm is what I'm thinking of. So pretty much what I need is a host, heatsink, and diode/driver setup so stupidly simple that even I can do it.