I'm a long-time vinyl DJ (since 1987), but in the last few years I've migrated to Traktor 3 (and hopefully Traktor Pro & Scratch in the future...), and I've been debating about this issue with myself lately, since I was feeling a little guilty or strange about using sync, etc.
But here's the realization I came to: I am currently of the mindset that sync is just another tool in the DJ's arsenal to choose to use (or not use) depending on what I want to do at the moment. Just like filters, effects, and looping are just more tools to expand the possibilities.
Personally, beatmatching is just not as interesting to me as it was once-upon-a-time, and there are other things i'd like to be focusing on. It's only part of the equation. So that's why I've really been trying to do more with Traktor, loops, multiple decks, and finally I've been discovering that DJing is exciting and fun again!!! The latest mix I did has, at times, four tracks going simultaneously (using two different MIDI DJ controllers and an external custom-mapped numeric keypad), and I am pretty pleased with how it turned out (I haven't posted it yet, but I hope to soon...). I was just surprised that it wasn't a total disaster!
![Wink ;)](./images/smilies/icon_wink.gif)
So for right now, I'm just really enjoying the freedom it gives me to experiment -- without having to worry as much about the gory details of timing...
Anyway, this is just my opinion, and therefore YMMV. I'd say just go with what helps you to 1) enjoy mixing more, 2) get really creative, and 3) feel best about your work. Use it, or don't use it... it's up to you.
Hope this helps, and have fun!
![Smile :)](./images/smilies/icon_smile.gif)