Horses for courses. Did my CPL in the States on a twin and yes it is a big step up from PA28 to Duchess, PPL to CPL plus doing it in another country. But I way I saw it (and still do) is that the cost and time of doing it in the US and then converting was same as doing SE CPL in UK; however as I have more ME hours now I will hopefully be relaxed about flying the aircraft when I get to the MEIR test which frees up (valuable) spare capacity. Doing all the IR on the Duchess as well. Does everything happens quickly? I suppose it does, but as I've never done a SE IR, I don't know any other speed! Plus this is only jumping from 100 knots to 140 - the next step should be far bigger than that!