I have had the new elife hooked up. They will install a second telephone line, so you will have two telephone numbers. The original number will still work, I am still using it. So no stress there. Only a couple of times have I tried to dial with no connection, but tried a few seconds later with no problem. No hard reset of the main box in laundry area necessary.
No visit to etisalat office necessary, no paperwork necessary. When they come to your villa to do the changeover, they will handle everything (two guys will just show up at your villa without appointment).
The new telephone number is also your new account number.
I had problems with the original router, but the replacement one has worked fine.
Waiting for my first bill to see if indeed it is less. I expect to see my bill drop around 80 per month. Yes, these prices are more than what the mafia would charge!
There is a data limit on the most basic package, not the faster ones.