Yes, dear guy, apply all the patches to take your TS 2009 to the highest... to the sky... to heavens... ... to build 44653 and you'll have something very similar to TS 2010.
I recently updated to SP4. I haven't had many problems with it yet, just started my first route in it to check it out so can't say much about it.
Performance wise, my FPS went from an average of 12 on built in routes like Tidewater to 45 and higher. EK3 gives around 40 average and the alpha trees look much better. For that I would say it's worth it.