I have. And as previous posters have already stated, it's a nightmare to get signed back up.
I cancelled last summer, and "re-enrolled" in February. Had to pay a one-time $15 fee + the first month's charge, so my CC was billed $25.95. In March I was billed the monthly fee of $10.95, then a couple of days later started getting emails from them stating my CC payment did not go through (LIE - the charge was on my Amex). I sent them 2 emails and tried to call multiple times, logged onto my EIDT account and changed the CC info to another card, but they never responded in any way. As of April 1st, I could no longer log in and kept getting a notice that my account had been cancelled. After multiple further attempts to contact them by phone I finally got a live person.
The short of it was, it was simply a nightmare to get my account reinstated. I did finally speak to a nice lady in the Billing dept (receptionist is a dragon who guards their lair and does not want to transfer any calls, so good luck with her) and after three more phone calls with her they did get my account re-set. It took until the middle of April to get this all resolved, and by that time my new CC had already been charged the monthly fee for April and I STILL couldn't access any of my reports. I ended up having to re-register as their system did not recognize my log-in information.
My advice is to never let it lapse, and if you do be prepared for a long and excruciating ordeal to get it reinstated.