there are different cases on a single page....one saying SUKAM is worst & other Sukam is best...this wont lead to any conclusion for a new person looking to buy a Online Invertor or Online UPS...On the other hand, i feel an online UPS is much better than an Online inverter as in mains mode the fluctuation in power will not affect the system...though for a ms even & comes at a bit high price....if u r looking for backup....u have to invest high...but if fluctuation is the issue then i wont recoomend more than 10mins of back up....