I have Toggle Mobile, ordered the SIM on Amazon US site. Worked great in Paris. I agree with the above that they need to offer data bundles for the other countries to become a really attractive service.
Also, regarding keeping account active, here are their terms from their site:
3.3 If you do not use your SIM Card to make a voice call, or send a message or data, or if you do not purchase a top-up using the Top-Up Services, for a period of ninety (90) days from the date you registered or activated your Account or your last use of the Services (whichever is later), Lycamobile will contact you by SMS or e-mail advising you that your SIM Card will be deactivated. Lycamobile will then provide you with an additional thirty (30) days to make a voice call, send a message or data, or purchase a top-up using the Top-Up Services.