I did one before with the GZA. It was $100 extra for the meet and greet, special pass to get back stage and watch rehearsal (which was about 30 minutes), exclusive poster for the concert and time to talk/ get stuff signed. It was definitely worth it. It ended up a little bit over an hour and there wasn't a huge about of people who sprung so it all worked out. Got to meet some people who worked on his second album who were there to support. You have to weigh the cost versus everything that they are giving you. Also consider that J. Cole is a "big" deal so the personnel might be pushy on some assembly line status trying to get people through all the stations as quickly as possible. Also, factor in time to get there hella early and plan on waiting while they check tickets/ credentials etc. I've also heard that they impose restrictions on items that can be signed/ how many they will etc. If you are a huge fan it's probably worth it so I say do it.
Drake got these dudes legs weak lmao
He's amazing, he's amazing
" 
and i got a pic with him that i dont have anymore 