hate to say it, but out of all the bottle warms I've used, I've yet to find one that doesn't have its drawbacks. We used Dr. Brown's bottle warmer with our DD and it worked ok, but unless you cleaned it out at the end of the day, everyday, it would get smelly and have stuff growing it. I was looking for a new, better one for this time around for when I pumped and hubby would have to feed DS, but hubby is pretty against getting another warmer with all the bad experiences we have had with them. For him, its easier to just microwave some water in a dish and pop the bottle in the warm water. 10-15 mins and bottle was ready. Our DD wasn't picky about it having to be warm or cold either which was nice so sometimes, we just gave it to her right out of the fridge and she was happy.
As much as you may hate to get a little crock to sit on the counter, it might be your best bet if you plan to use bottles a lot. Otherwise, just heat up some water in a dish. Bottle warmers really are a money making scam unless you don't mind cleaning them constantly.