Cloning a SIM is almost impossible.
You GOTTA chop up your sim, but so what? SIMs arent fragile. And you can always buy a replacement SIM if you're clumsier with scissors than a kindergarten kid.
I got a dual sim adapter in my E61 and it works very well. When you turn on the phone, you got a new application icon that appears in your menu called (SIM Services). When you load it up, you got a simple menu with your two sims, and two timers and two customized info.
All you can really do it select the SIM you want to switch to, and then your network connection will drop, and reappear after 3-4 seconds, using the new SIM.
you don't really have much more features with the dual-sim other than an automatic timer to switch sims.