There are definite improvements for those who like to "tinker under the hood". But those same improvments set the stage for even bigger things in the near future. Those future upgrades will require PBP3.x as a
starting point. I would encourage all to make the change now for several reasons:

1. It isn't that expensive
2. When you ask questions on this forum (especially if they are hard), you will get more/better responses. As an example, I find myself less likely to help someone who uses 16F parts or some early version of PBP. MELabs will probably also be more likely to want to help - if it comes to that.
3. The new features are good ones. Especially if you use a several different chip types in your projects. It is also possible to add some of your own commands.
4. You will need PBP3.x to take advantages of any patches, improvements, or the next version, when it comes out.