I really don't like the modified sine inverters much but they are cheap. I haven't seen any problems with laptops but considering the price it would be good to check.
I'm sure it's already listed on this site somewhere but... In general modified sine inverters work well with switching power supplies (most digital stuff, CF etc); resistive loads (regular lights and toasters) and where there is a battery being charged (wall wart to a cell phone).
Modified sine inverters are not good with inductive loads (power tools, air conditioners) and are really bad for most AV products(TV, radio et. al.)
Sorry, have no idea about microwaves, they could go either way.
I have a 150w in the Vibe (lap top, cell, PDA) and "cabin" (cf lights only) and a 1kva (1000 watt) pure sine wave for tools and telescope (cameras) stuff.
Isn't it nice to have so many options?
