Glad your interested! If this helps you carry less to a gig, so be it!
Alright, so I have the new MacBook Pro 13" late 2010, Its great for my mixes and productions, but I know pretty much any laptop that can run windows 7 well and smoothly will be able to do this.
It has a 2.4 GHz Intel Core 2 Duo processor and 4 GB’s of RAM. If one of your laptops has a dual core processor and at least 3 GB’s of ram this will run smoothly. (Considering its not one of the new netbooks with a dual core atom, I don’t think it will work smoothly, because the Intel atom’s are ment for more internet productivity, so probobly not the best thing to warp .WAV’s and up song’s pitches with traktor at the same time
)
As for the stability, It’s great! I’ve stress tested my setup by pulling out my controllers usb cables in the middle of a set, and so far the programs don’t stop! Obviously a usb sound card may be different, but I’m out of town, and don’t have all of my gear, so I’ll write on here as soon as I test it.
As far as the windows vs. mac os x thing for stability, mac os x will run this setup smooth if you quit all unnecessary processes and keep only the apps you need open. And for windows, as long as you have a good anti virus program, or keep you system isolated, you should be set! (Provided you do the same thing for a mac, quit all unnecessary processes and keep only the apps you need open.) Oh, and turning off the wi-fi and bluetooth radios will provide a sandbox around your pc, so no outside network interference will have your computer working on other task while your djing.
And as far as issues go, I just figured this out while thinking of new creative ways to make/play music with my MacBook. Iv’e used it for about 3 days nonstop, and it runs buttery smooth, but if I encounter any problems ill post them here (along with the soundcard stress test)
I hope this helps, if you have any other question just ask!