I have been thoroughly impressed with my 500L. I have the 1.3 Diesel version, and economy is as you would expect, pretty good (around £50 for over 450 miles, sometimes more depending on how you drive), and it's certainly not bad in terms of acceleration and speed .
I picked mine up at the beginning of October and being the Pop Star trim, the standard kit is good (mine has the 12V socket in the boot), but because of the offer I received, I managed to get the Beats Audio system, front fog lights, electric rear windows and 17" alloys added. This deal worked out pretty decently for me at the time because of the offer, so make sure you push the dealer for a decent amount of kit, because it can happen
The diesel engine isn't too noisy either, but I tend to have the music up loud anyway as the system is fantastic, certainly recommended if you can get it!
Like MJG says, it's look and feel is nothing really like the original 500, but I really like the individuality of it, as the other makes in this sector tend to be oh so practical, but oh so boring too...the 500L is anything but boring! It's a car which stands out for it's individuality.
I'm of average height and ensuring that the steering wheel is in the right position (not only does it adjust vertically, it also moves forward or backwards too) ensures that only certain aspects of the control panel are less visible, and the cruise control lever is practically hidden. That said, once you know where this lever is, you don't need to see it to know that it's there
This for me is an absolute godsend. I have already done 3 or 4 long motorway journeys, and it certainly makes driving those distances less of a chore and much more enjoyable.
With the advent of the 500X, I would say that you may want to wait to see what kind of deals there are coming for that, as that looks a lot like a traditional crossover (Juke etc), but that will inevitably bring the offers in for the 500L too as Fiat will want to ensure that they get the most sales they can before the new version hits the forecourts.
It just depends realistically on if you can cope with the styling really, as inside the car is great, spacious, practical and everything you would expect from a new car these days. I know I love the car and even though it's not for some, those who I have shown have all commented in a positive way as it is surprisingly bigger than they expected.
OK it's not going to set land speed records etc. but if you want a practical car with plenty of space and a style of its own, then it should fit your bill....time to take off the rose tinted glasses