Oh come on Sivadam. It is pretty apparrent by the volume of complaints on this site about SIMS.net that there are a good number of unhappy customers.
I will give SIMS.net credit when credit is due. It isn't a bad system, but the QA and overall finish to the product is relatively poor - things like column headings not reorganising a list, functions existing but not being at all visible or apparent to the untrained eye etc... An example - why is there a 'future' option when browsing pupils but this option doesn't include pre-admission pupils? Why does the batch import of photos segregate males and females for alphabetising? Why are some pre-admission tutor groups listed in red, and some (simply because they have the same name and person, but are in fact an entirely different group) are listed in black?
There is a long list of such irritations that get brought up on here regularly, yet you consistently jump to the conclusion that it is simply user error. User error is when a product is poorly designed. User error shouldn't exist, if a product is well designed.