I've switched from OS X a few months ago and I'm actually happier with KeePassX than with 1Password. I hated AgileBits for the 4.0 bloat redesign which made everything slower (this is a constant on OS X it seems). I have a pretty simple use case with KeePassX (no sync) and here are the solutions I've found to problems mentioned in this thread. Hope they're helpful!
Hide KeePassX's window:
Just open the settings, click the first two checkboxes ("system tray icon", "minimize to tray instead of taskbar") and add `keepassx -min` to your login script. It'll ask for your password and disappear.
Title bar:
KeePassX does use the browser title bar and it's sometimes not reliable. It's easily fixable, though. Install a Greasemonkey plugin to your browser and add scripts such as this one:
// ==UserScript==
// @name Google
// @namespace google
// @include //" rel="nofollow">https://accounts.google.com/*
// @grant none
// ==/UserScript==
document.title += " | Google";
Browser plugin:
I like how I could type "gmail" in Alfred and have 1Password do everything for me. I was able to reproduce that with a bash script that I call from my own launcher and it works just as well, if not faster.
#!/bin/bash
nohup xdg-open "https://example.com/" >&/dev/null &
wmctrl -a Opera
sleep 1
xte 'keydown Hyper_R' 'key dollar' 'keyup Hyper_R'
Last line simply simulates my KeePassX Auto-Type shortcut (which I got from OS X, yes).
Update:
are newlines, can't believe it's this hard to post code snippets here.