Well I always prefer Sponsoredreviews.com over all networks in case if you have quality blog. Reasons are Sponsoredreviews.com have more jobs then other Networks and if you have high quality Blog which have many links and traffic then you are heading towards big income! Also there will be no issue with G Penalty like it happens with PayPerPost.com!
Yup and most important thing is you get payment on time and hardly you have any issue! Also if you priced perfect, you will surly get more orders!
I join this site but never write for them. The reason is all the advertiser are paying very low price, not worth to work for them.
there are lot's of blogger there. so winning a bid is a little problem. if you have good pr blog then there will be chance to win the bid. if your blog is not of good pr then you can't win the bid. i have also bidded there a lot but didn't get any job. try other websites as well. i have a lots of website pm me.
Sometime advertiser contact you directly. Once got contact, the bid usually high enough. If you looking a job at its marketplace, almost bids are between 3-5