but would you consolidate your loans if all your loans were unsubsidized direct loans? I am hearing both pros and cons.
There are definitely pros and cons.
As far as I'm concerned, there are the reasons to consolidate federal loans with a federal consolidation loan:
1) To bring FFELP loans into the direct loan program (so they will be eligible for REPAYE, PSLF, etc). This only affects pre-2010 borrowers I believe, as I think 2010 and after are all direct loans now.
2) To allow you to start repayment ASAP after graduation. With the processing time, you typically start repayment 3-4 months prior to when you would normally, as the grace period lasts 6 months. The primary reason to do this is that's 3-4 more PSLF-eligible payments. Not too many benefits otherwise.
3) You can apply for $0 payments for that first year as you will have no income when you apply to consolidate if you have just graduated med school but haven't started internship yet. Of course, you're starting repayment early, so you're only getting about 8 months of $0 payments relative to what you would have had otherwise.
4) If you just don't want 10 different loans, then you simplify things by consolidating. But it's all psychological, since you're only making one payment anyway and your servicer calculates how much goes to each loan.
The cons are:
1) You lose the ability to selectively pay off the lowest interest rate loan
2) Your interest rates will be the average weighted rate of all the loans, rounded UP the nearest eighth of a percent
3) Your servicer may mess up the consolidation (like with mine--they let me add a loan but they forgot to take it into account when calculating my new interest rate, which was now artificially inflated. It took a few months and having my financial aid director talk with a real administrator (not the "supervisors" you can talk to on the phone) at the loan servicing company
4) You lose any IBR/PAYE/REPAYE (as well as PSLF) eligible payments, as your loan is now paid off and you are taking out a new one. This is why if you plan to consolidate with a federal loan, it's best to do it ASAP.
For most people, I don't think consolidating is going to save them money unless they have loans that need to be brought into the direct loan program to be eligible for REPAYE as well as PSLF. If your loans are already all eligible for those, the only reason to consolidate, in my mind, would be if you just want to start repayment earlier and thus start building up credit towards PSLF earlier. There is also the small and temporary benefit from the possibility of $0 payments, but I wouldn't bank on that because your loan servicer can ask you for updated salary information at any time.