I highly recommend vdebug (https://github.com/joonty/vdebug) if you're looking for a great Vim interface to DBGP debuggers (for PHP, Python, Ruby, Perl, Node, etc.). Really nice, especially compared to the countless half-broken and out-of-date Vim/DBGP plugins that are scattered around vim.org and github.
Maybe this is great for PHP, where DBGP is the standard, but...
I tried this for Python and was greatly put off by the need to download an obscure debugger tarball from ActiveState with some weird license on it, then (according to the vdebug documentation) run a very long command line by hand passing the name of the script every time I want to debug something.
If I am going to trouble myself with that, it's hard to understand why I don't just run a standard standalone debugger which works in the expected way, from the command line. I definitely don't see how it reproduces the experience of (say) pressing a debug button in Visual Studio or Xcode.
