With the exam cutoff looming there have been a ton of questions lately about if people should take the composite exam. The short answer is....no, probably not.
Generally speaking the composite is only for the experienced network professionals who are used to certification exams. It is really meant for convenient switching to the R&S track from say Juniper.
Why not take it? It's just considered to be a much more difficult exam because:
It doubles the number of topics you can be tested on, this makes it so you must have mastered everything in the CCNA since it is fair game. This also makes repeat attempts harder since the question pool is large enough that if you do badly on say IP Services, you might instead get a security focus the next time.
You have a smaller margin of error: with ICND1 and 2 you can get say...10 questions wrong to pass with the minimum score so you can get 20 questions wrong and still be a CCNA. With the composite you can only get 10 wrong before failing
There is less padding questions, icnd1 may also you 10 subnetting questions but the composite may just ask a couple and move on the next topic. This makes things harder since your more likely to hit a hard question rather than get a few easier ones.
Cisco assumes your a network professional so they may hit harder than with the other exams.
Based on my own observations from watching this sub and talking to people, I would say a junior has about a 90% fail rate for the composite and it typically takes them about 3 tries to pass it. Incidentally they also tend to be bitter with Cisco after paying for so many failed exams. Long story short, it isn't worth it, I should also point out that you get the same CCNA no matter what path you take. The only difference is that with the two exam method you get the CCENT as well, which means you can get up to two kitty gifs!