If this would be your first experience taping, and if you arn't interested in taping in general since this is a one-off experience, then I (personally) wouldn't.
From a security standpoint, there will be more light on you in the first row (which generally doesn't have very good sound for taping***) then anywhere else in the venue. So your odds of being caught are exponentially higher. So once you mitigate those by conceiling your equipment, the recording that you get out of it, generally isn't worth keeping or listening to again. If it's going to be a fairly large show, consider seeing if anyone else is going that generally stealth tapes and offer to assist in any way they think might be helpful.
So in that light, I think Brian's 3rd and 4th questions are the biggest ones that you should consider, then a 5th would be "what likelyhood do you see yourself taping again". If it's not very much, then I (personally) don't think it is worth the expense and the cost of the experience at the show.
**Orechestral, and other unamplified instruments being the exception.
Disclaimer: I gave up stealth taping and my wife will *never* go to a show again with me if I were going to stealth tape it, it's just not nearly as enjoyable.
Best of luck, take care.