Babies R Us often do a deal that gives you the car seat for free - the lady in the shop also told me that if you can find somewhere else (either store or online) that is either cheaper, or is offering the free carseat when they're not, they will match it.
It was the one we were definitely going to buy as we couldn't afford a Bugaboo, and we loved the ease of it and the fact it came with everything. I know that one of the main selling points are the bright and colourful designs but unfortunately I just didn't 'love' any of them. We probably would have gone for the green/Treet design in the end but I still preferred the look of plain ones. As it happens, someone I knew was then selling her Bugaboo for very cheap, so we bought that while we could - but we definitely would've got the Giggle system if not, as it's brilliant.
Have a play with one in a shop, you'll love it (it's so much easier than the Bugaboo we now have!)