There's no denying. If you are looking for the best mobile broadband package in the country, then look no further than 3 UK's just released microSIM package which gives you 10GB for £15.
The best part of the deal though is the fact that it is a rolling contract which means that you are not stuck with the service provider for more than 30 days at a time.
The only issue some might raise is the fact that while 3 UK claims that it has the best 3G coverage of the country, patchy areas seem to be strategically located along busy railway lines (ed : Paddington basin and around Mill Hill Broadway based on our experience).
There's also the fact that other rivals like O2 come with unlimited WiFi connectivity which come handy in urban areas like Central London where O2 has an ongoing partnership with The Cloud.
These two teething worries aside, the microSIM bundle remains our firm favourite. Buy a microSIM to SIM adaptor from Ebay for around a fiver and use it either in your broadband dongle or embedded into your notebook.
It is very unlikely that 3 UK will forbid you from proceeding with this small modification simply because you will still be using the SIM for data-only albeit in a different device.