This. The purists will disagree with the no tone loss part, but to me the difference is negligible; the difference in stability and usability is not.
That being said, I'm a bit paranoid about tuning, so stability trumps all other concerns. If a guitar sounded great but didn't stay in tune when the whammy was used I think I'd leave it alone. You also have to look at application. What type of music are you playing? Are people listening to you really going to notice when you are playing live? (That is, if you are playing live.) Will you notice? I used to be quite anal on this point, but have since grown to realise that the differences in most cases (outside of the studio!) will be negligible, and that most people won't care much. In the end you'll have to decide for yourself, but do keep in mind that very few people except yourself are likely to notice.