Personally, now that I have been in the business for quite a while, I love it when people interview other agents and make their choice. I like working with consumers who are prepared and making an informed decision.
The first time we bought a condo though I hadn't met Nannette yet, so we informally interviewed about four realtors. By informally I mean meeting them through open houses, etc., and just asking questions on the spot, finding out how much they know about the market, finding out how compatible we were as people. We ended up working with someone from ZipRealty and let me just say that our experience was horrific beyond words. The 20% commission back from the realtor is not worth all the hassle and trouble we had to go through working with her. Luckily we've been able to find a much better, more suitable realtor for us since.