Is simplenote for iPhone worth buying?

I just found out about this application called simple note. I’m seeing amazing review for this product. Could this be a simple todo/task manager replacement? I was looking at Things for mac, and realize this may be a better and simpler option. This article http://www.macstories.net/news/justnotes-notes-simplenote-client-for-mac/ shows new desktop integration as well. Can I get some opinions on whether or not this is a worthwhile purchase?