Happy with 25/15
I had 5/2 service with FIOS (somehow I missed the free upgrade to 10/2). I was on a triple-play package with TV Essentials, and found that I could upgrade to Extreme HD for only $10 a month more. That gives me MANY more HD channels, and in addition the very knowledgeable customer service rep told me that upgraded package would give me 25/15 Internet at no extra cost. The only catch was that I had to agree to a new one-year commitment, but I also have a two-year price guarantee.
I could hardly believe it, but it happened as she described. I'm extremely happy with 25/15, which is more than I can foresee needing anytime soon.