Moved up recently to 10nl as well and talked alot with people in the irc about responding to getting 3bet. Basically, here is what I took away.

1. When people on your left are 3 betting alot, it is a large incentive to leave the table. You should have a reason to stick around because so many decisions that were + ev become marginal when so much of your range is just going to have to fold.

2. Do not 4 bet without a sample size. I was making the mistake of getting frustrated by my steals getting repeatedly 3 bet and i started 4 betting wide against players who i really did not have the information to do this profitably. This can be a huge leak both because alot of the time you will be 4 betting players with tight calling ranges, and because regs at 10nl, especially those with a propensity for 3betting, are prone to getting involved in dick waving contests and may not give up.

3. Taking notes as to how players react in 3b/4b spots is HUGELY important. It is essential that we do not form habits for reacting based solely on the % someone 3 bets.

Good luck