RE: Avent disposable bottles
I think that disposables are great for travel. I bought a disposable set for travel and now I use them all the time since it was so convenient. I also use the drop-in liners (which can be used in most bottle systems) and they make it even more convenient. The regular bags have to be put in just right or they leak. With the drop-ins I have no problems.
I have never heated bottles, so I can't help you there.
HTH,
Beth, mom to older DD (8/01) and younger DD (10/06) and always missing Leah (4/22 - 5/1/05)