I used to work in a school that used Pearson e1. Having just started a new Data Manager job in a new school that uses SIMS I can now compare the two and if it were up to me I would choose SIMS. Its just far better and far quicker to acheive simple tasks. With e1 we had to have lots of Access Databases for functions that e1 simply couldnt perform, we also had to keep running an old copy of Phoenix Gold just so that we could perform the staff absence and cover because the way it works in e1 is too labour intensive. In fact I would say that is the main problem with e1, its far too labour intensive in every way. You feel like you are going 'around the houses' so to speak to perform very simple tasks, such as changing teaching sets, timetables etc, it all takes a lot more time than it should. Also the support staff, whilst very freindly come across as not having a clue about how to solve any of the problems and always have to call you back. From what little time i've spent using SIMS so far it appears to not suffer from these problems, whether there are other problems I havent faced yet only time will tell, but my advice is steer well clear of e1.