Guess I could chime in, as I have spent way too much money backing projects on that site.
Anything gadgets and video games do well there. Anything Titanium, especially pocket tools, seem to be doing quite well on there right now. The craze does seem to be tapering off a little bit, though... since there have been a good amount of them recently. You have good designs, so I'm sure anything you put up there would do just fine. Can't sell knives there (otherwise your credit card knives would probably sell like hotcakes over there), but it would be a good way to get some more attention from people who don't browse these places.
Biggest thing if you're considering it: be reasonable with your estimated completion date. It seems like with a lot of projects, people get completely overwhelmed with the amount of backers, and don't come anywhere close to delivering on time. I'm still waiting on "Rewards" from projects that were supposed to be completed as early as last July. At the very least, be the guy that updates his backers constantly.
Also, if you do it, having a good video and pictures. Nothing kills a potentially good project easier than crappy (or not enough) pictures and a cheesy video that has the editing of a 7th grade English project.
I'd only really make a KS project if you plan on outsourcing some of the production though. Your stuff seems to sell fast enough here, and KS takes I believe 5% of all sales.