I don't mind it, but I think too many bloggers are influenced by the money. I have seen plenty of articles that disclose the sponsorship of the post, but I even saw one that said "it’s something I would have never covered on my own". I understand that the money is awfully enticing, but don't let that influence your content.
If it was something you were going to write about anyways, and you are getting paid then that is the best solution. I agree with you though pdedecker, I just want the reviews to be honest.
We've never done a sponsored post on our site, but we have done giveaways for software that we personally tried out before contacting the company for free licenses. That is the closest we have come to a sponsored post though.