Recordr is the easiest audio/sound/voice recorder you can find. You can have the recordings automatically sync across your devices with iCloud. It even allows you to record and play in the background!
Other features includes:
1. Sync files via your iTunes.
2. Share recordings via SoundCloud
3. Backup media files to your Dropbox account
4. Upload to your Google Drive™ Account
5. Send to friends via E-Mail.
Recordr produces high quality recordings that can be used for interviews.