As with all City sets you tend to get better value for money than licensed products. I love the new mining helmets with the light (a 1x1 round tile). The 4x4 is a nice sturdy vehicle and the wing mirrors are a nice touch on a small model. I like the detonator plunger, nice use of three standard pieces! I had 10 spare pieces with this set, that's nearly 10% of the total, surely some kind of record for Lego? The only downside - the dreaded stickers!! Luckily there's only 3 in this set.
On to 4201 - "Loader and Tipper" 12.99 GBP for 139 pieces.
A little more costly per piece than 4200 but still good value in my opinion. Personally I found the front and rear windscreens on the tipper truck not attached too well to the rest of the vehicle, causing them to fall apert when I tried to put the roof on. It might be me being heavy handed..... Two vehicles, two minifigures and plenty of spare pieces (11 in this set!!), augurs well for the bigger models. Maybe because it's a new theme (new for City anyway) I really like these mining sets and can't wait to get the bigger and more interesting ones.
Post script: Finally started the third and final floor of the Town Hall. I'm getting there...