Why? I don't understand the arbitrary 30 day limit, or the need to be charging at all for the basic service. It seems like the best way to gain adoption for a product like this is word of mouth. As a totally free product, they could get thousands or tens of thousands of users in a short time period. Real people having positive experiences with a product is the best marketing there is.
The strength of glance seems be design and UI. Charging a monthly fee doesn't seem to be the best way to take advantage of that strength. Nice UI products do best when they have lots of people using them. I feel like it's too much trouble to set it up knowing that I'll have to make a purchase decision after 30 days, (not to mention that it doesn't say what the price will ultimately be). This looks like a cool product, but this might not be the right business model.