I just completed a buy on local trader - totally great and serves a very valuable purpose.

Some comments on user experience:

• It's not clear what the different alerts mean - there are two types of alert. 1) The dot on the localtrader button inside the app seems to come and go at random and has different colours and I wasn't sure what it indicated - presumably new activity but it didn't seem to correlate with new activity. It would turn up when there was no activity and it would not go away when I expected it should. 2) The status-bar notification at the top of the OS can only be cleared from the status bar, not from doing some action in the mycelium app. It wasn't clear what that icon was indicating, although I assume it was 'new activity' even though it didn't seem to correlate very well with that. In general I felt that the alerts for 'new activity' were not timely, had unclear meanings, and were consistent with my expectations.
• The 'final' screen after opening a new buy shows a chat window and accept/abort buttons. I felt that it was not clear what I should be doing next on this screen. I think the accept/abort buttons should be below the chat, since logically the user will chat first and only later press the buttons. Moving the buttons allows the user to clearly interact from the top first, then end interaction at the bottom. Chat first, then use the accept button. I initially wondered when to press the accept button and what I would be accepting (was I accepting the rate or was I accepting that the trade was complete or what?) Putting the buttons below the chat makes it clear to chat first, then once the chat is resolved (ie you are meeting with each other) the users should use the accept button.
• Response time to actions such as chat and accept was not very fast, in the order of tens of seconds. The UI just seemed a lot slower to respond than I would have expected from a normal internet-connected app

Overall the experience was fantastic and I would gladly recommend anyone to use local trader. With a bit of polish it will be more clear which actions the user should be performing (and in which order) to complete the process.