I had the icandy apple for dd2. It could go from 4 wheel to a 3 wheel by changing the front wheel. Never used the 3 wheel option, so can't advise on how that was, but I can give you the pros and cons I can think of:
Pros:
-love the fact it can parent face and face away too
-good quality
-sturdy
-compatible with maxi cosi car seat
-easy to take seat/carrycot unit off.
-the official icandy apple footmuff is really nice and cosy
Cons:
-as your child gets older (about 2yrs, it's really heavy to push)
-it's got air filled tyres which can be a pain if they puncture
-I found it hard to figure out how to fold up, but once you know how it's easy.