I keep several species of chameleons and for nearly all (bar 1) of my chams have used exo terras for them as hatchlings.
They are not a long term housing option but they are, in my opinion, very good for starting out with. I know of lots of people who aslo use them for thier babies and hatchlings with no ill effects.
I don't agree with the whole chameleons in pairs routine personally - not veileds certianly as they are so easily stressed and, despite popular myth about them being hardy and tough, they are quite sensitive to their surroundings. The fact that a female fires up defensivel when she sees a male and is not wanting to mate paired with the fact that, in nature in their natural environment, they are very solitude aniamsl is enough of a reason for me anyway but each tot heir own.
I know of people who have successfully housed Mellor's chameleons in pairs but these arne't really beginner chameleons and can come with a wealth of other problems to someone who isn't experienced in general chameleon care.
Lostcorn - if you are wanting to get into chameleons and make the leap into geting your first one, I would suggest reading up a lot first - there are many good chameleon infromation sites out there and I have put some links at the bottom of this post for you to take a look at.
Be aware that what works for one won't always work for someone else and that you must read all the information you can and then decide the way forward which you feel most comfrotable with and of course, that is going ot be the most favourable conditions for your new chameleon. Best of lucka dn if I can help at all with any questions you may have, give me a shout
http://www.ukchameleons.co.uk/captivecare.htm
http://www.chameleonnews.com/index.html
http://www.adcham.com/