I'm a happy Kagi subscriber but I find that I frequently have to switch to one of the competitors for a particular search. The problem is that when Kagi can't find a good match, it just says so and returns nothing. That's fine for some things, but other times I want any results, no matter how tenuously related, so that I can use their verbiage to iterate on my search to get some results. It's not a big problem since you can just prepend a `!g` etc,, but it makes a clean shift to Kagi a bit harder.
