Pros - you can jump as close as a chalk's width away or as far away as table length if your stroke and skill level will allow it. You will have a wider range of options when you step to the table. Your opponents will have a harder time playing effective safeties when they know you have a jump cue.
Cons - jump cues are not allowed in all tournaments and leagues. There is the chance that you may sacrifice your kicking game because of the ease of using the jump cue. You might be tempted to "overuse" it.
I like the jump cue because it gives you a wider range of options and tends to even out the poor and unintentional safeties. Ball in hand rules mean that the player who gets ball-in-hand ususally has a huge advantage. So unintentional safeties reward the outgoing player and the jump cue tends to equalize this a bit.
Reccomendations: First - the Bunjee Jumper because I developed it

) Seriously, the Bunjee has many imitators out there but few equals in performance. Many have tried over the years but very few have been able to equal the Bunjee's consistent performance in all jumping categories. Those categories are, control, "jumpability", comfort and consistentcy. The ones that have managed to approach the Bunjee are usually more expensive. And none offer a guarantee as comprehensive as Bunjee does. Gosh - after that pitch you'd think I still owned the company - I don't - go to
http://www.cuevalue.com to find out more on the Bunjee or htttp://www.bunjeejump.com
Now, what ELSE do I reccommend: Good jump cues that come close to the Bunjee are the Airtime, the Jumpster, and Jumpin James.
Like I said above there are many copies of the Bunjee out there and many CLAIMS that those cues are "just as good" or "better than" the Bunjee but in reality they are not and have never beaten the Bunjee shot for shot in heads up competition. I used to offer a $500 to $100 challenge for anyone that bring a cue that could beat the Bunjee in ten shots and NO ONE ever got the cash.
So, good luck and I hope your jump cue choice is a Bunjee. Whatever you choose please remember that it is not a magic wand and will require practice to master effectively. You can find a tutorial at
www.bunjeejump.com that will apply to all jumping and all jump cues.