I think the biggest change with external defibrillators has been placement. It's now front and back instead of two on the front.
Also, you should call the emergency number in your region and (at least in Australia) they'll transfer you to someone who can coach you through using the defib and performing CPR until professional help arrives.
Don't let that stop anyone from getting their CPR up to date though. The more experience you have the better equipped you'll be if you need to use it