The team at slashmobility is very friendly & always happy to help with any queries I have! They offer great customer service which makes working together so much easier than dealing directly online for me as an agency.
It's not too hard if you follow their guides but it can be quite confusing when they change something around or add new features - sometimes this causes problems that need fixing! If using them regularly then there isn't anything really wrong with having a contract set up because of how easy it works!