It's free to use now, but since it was made by PayPal you can bet it won't stay free for long. And read the fine print of the user agreement. Any funds in your PayPal account or any accounts or cards connected to it are subject to being frozen at any time for any reason. I'm sure this program has similar rules.
A quote from this article about Venmo:
http://www.dukechronicle.com/article/20 ... rise-venmo"A unique aspect of Venmo’s money-sharing service is its social news feed, whereby people can see what friends and other students are paying for and to whom"
Um, no thanks!
Your friends could just as easily pay you cash. That's how I pay my friends, and how they pay me! Or, if you use the same bank you can usually do direct account transfers for free.
I haven't owned a checkbook for almost a decade, and my business doesn't have one either. In the rare case I need a paper check, I can get a bank check at no charge or pay a small fee to get a Postal Money Order.