You should not have any problems so long as you arrive >1 hour ahead of time (if you're elite and such)

Your bags go through more stringent checks than usual behind the scenes, and you get a little interview.

as craz said, they frequently [over] sell out the TLV flights and thus, it would be a good idea to make sure they don't invol you due to not arriving at the specified time.

in TLV, they sometimes seem a bit disorganized and you might have to push your way through to the elite section, they do a much more thorough interview and screen your luggage before you get to the check-in. in addition, you have to wait for passport control and the next screening, that is usually not as long of a wait.

I'd recommend arriving 2 hours in advance in TLV. The shopping mall inside is pretty nice, its actually amazing all the stuff they have there. And the VIP lounges are very nice as well.