My sim kit arrived today and appears to be the same as the one I received when I opened my original account. I do not intend to activate it until my next trip abroad which should be in Sept. of this year.
I'd suggest if you are interested in their service, you act soon. I did not see an end date to the offer but I don't expect it to last too long.
My personal experience with the sim switching on a phone is, that it works quite well and remains on whatever service you select reliably. I'd actually like to see other companies use something similar to this "Pass Through" option in Settings for accessing alternate carriers or log ons without physical sim swaps.