I thought about the microlight option when I started to learn but decided against it for two reasons:
1) I wanted to add some additional ratings such as night, twin engine etc further down the line
2) most importantly for me, you can only just carry two sensible size adults in a C42 or eurostar (weight wise). I wanted the option to be able to put some luggage in and go away for a weekend.
Yes, the performance of the new type microlights is very good but if you want to add additional ratings or carry more weight you're a little stuck.
Steve