As far as i know they are a good company, they seem to specialize in making products for the office suite.
There has been no nasty surprises and i have even managed to get the icon to move so that its on the main "Home" Ribbon, this allows you to turn the zoom on & off if you want to.
i think the only reason the outlook is slow to start is that its checking to see if the addin has been paid for or is still in trial mode.
you also get two years of free email & Phone support.
Thats about all i can tell you really, like i said ive had no problems with it & its working fine, i also tried one from another company that had a trial, that was $9 i think but that didnt work as i expected so i removed it.
Hope all this helps, i would give it a try but the choice is yours.