Im finding 1Writer sits in a sweet spot for my modest needs. It has enough features to do what I need and not so many that its overwhelming. It has been solid and stable under iOS 8 and 9. Its extendable and has a reasonable number of useful enhancements that can be installed. Maybe not as many as some others but honestly I dont need a lot for what I do on an iPad. I do like that it doesnt impose a specific Dropbox folder but instead has access to any of my Dropbox folders. I had a UI question (related to using a Bluetooth keyboard instead of the iPads keyboard) and got a prompt, truly helpful reply from the developer. I have two other iOS Markdown and text editors, but 1Writer is the one Im reaching for first.
snlsn about 1Writer - Markdown Text Editor