I tried your plugin out and it worked well, but I have no reason to switch. The one thing I can't do without is being able to quickly search through all of the files in my project. Is there any way to do this within Proj?
Nope, it's simple by design. Project.vim seems mainly for projects that need to pull in files from all over the place and probably fulfills that goal well. If I need to search the working directory, I'll use ':!grep -RI "term" .' (or vim's grep which is pretty nice).
I say that project.vim stinks because it's awkward and its usage is unclear. Maybe I've never "gotten" it, but I think there are many others like myself who really, really wanted to like project.vim but just couldn't use it.
I have my mind on other goals. One is to add a toggleable split that gives useful version control information by integrating with the VCS plugin.
Also, why make me put quotes around the project name?
You have to put quotes because otherwise Vim complains about using undefined symbols (I don't plan on using the command interface in the long run; probably something more like what MiniBufExplorer does, or even FuzzyFileFinder's hack of the completion system). I agree that it's clumsy, but the command interface is limited, and can only accept paths with quotes omitted.