Totally worth the price of admission! I can't believe I haven't done it before this last trip to Vegas!
My hubby and I got a coupon for 2 for 1 admission ($10ish total - score!) and decided we would give it a go before our show Friday night. It was 5:30P when we made our way up, but night had fallen already and we got the good view of night lights of the Vegas strip. As an added bonus, we got up to the top seconds before the Bellagio Fountain show. It was AMAZING from up top. It added so much to the whole experience.
There was a line, since they can only take so many people up at a time, however it didn't take long. Everyone seemed to easily move around up top without being crammed in and they have a safety grate to keep everyone in (for those who are afraid of heights).
I love seeing the Strip from a bird's eyes view. It isn't to be missed!