I used to work on Symbian (C++ code) for a few years, and the fork and eye comment from nobody_nowhere sums up my experience. [ We did have quite a nice product, http://prosessiongolf.com/, but I guess it was too much too soon in terms of people spending money on applications for mobile phones. ]
More recently (last year) I wanted to test an app concept, and built it with PyS60, i.e. Python for S60. Working with that platform was really nice, very good for rapid testing, but getting the installer right for some beta testers around the world was already a pain -- wouldn't want even to try a full commercial release. Also the UI APIs are quite lacking. But still, really nice working in an environment where you have the Python console running on the phone, connected to your PC via Bluetooth for running commands directly.
More recently (last year) I wanted to test an app concept, and built it with PyS60, i.e. Python for S60. Working with that platform was really nice, very good for rapid testing, but getting the installer right for some beta testers around the world was already a pain -- wouldn't want even to try a full commercial release. Also the UI APIs are quite lacking. But still, really nice working in an environment where you have the Python console running on the phone, connected to your PC via Bluetooth for running commands directly.