We used to use the dr. browns too. About 2 weeks ago we switched to the playtex dropins b/c we already had a bunch. It took about 4 days for DS to get used to the bigger nipple (it took him about 45 min to eat instead of his usual 15 min). I'm really happy we switched. It only takes me 5 minutes to wash a days worth of bottles compared to the 30min it took me to wash the dr. browns everyday!
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We used the standard Dr. Brown bottles with DD when she was a baby but also switched when she was around 4 months. We switched to the Evenflo Purely Comfi bottles and used the Dr. Brown nipples in them and they worked great. Plus she had no confusion changing bottles.
Re: bottle nipple similiar to dr. browns?