The UI is clean with very few options which are easy to understand by anyone without any experience in security systems or even IT world at all! It takes some time before you start getting used it but once your learn how things work there's nothing bad about this platform as far I'm concerned now (almost 3 months into use). My employer has started using SISIM since we bought new office building around 1 year ago so my job became much easier than managing physical keys alone - no more tracking down lost/stolen cards etc., just login online through mobile phone app from anywhere inside country & outside too!! We don't have anything yet that would like us dislike if not good enough quality-wise; everything seems ok except maybe sometimes when users forget passwords they may get confused due lack information what password should be chosen next while trying figure out why he couldn’t log back again after several attempts already tried ;-) otherwise.