As an employee there, and an operator of TT, I can tell you that it varies by which car you are in and by how the weight is distributed. If the weight is uneven (heavier people on same side), you spin more and therefore may "bump" around more. Some cars go through the course and make a ton of noise while others will travel right above your head and not make a peep. It varies I guess. Also, that sudden stop you may have felt at the end of the course was the transition from the magnetic brakes to the boosters (drive wheels on the track). Again, the severity of the jolt varies by the weight distribution. I'm not trying to sound like a "Know-It-All", but that's the best explanation i can give you i guess. IMO, Timberland Twister is the best of the Gerstlauer spinners. It incorporates its surroundings better than the other ones I have ridden.
The new Euro-Fighter should be great. I just rode Mystery Mine last week and was completely blown away. Granted, Mystery Mine has a ton of themeing, but the ride itself is pretty good too! Also, I haven't seen too many people talking about it, but the Park WILL!!! be receiving an Intamin Halfpipe. I was talking with the GM a few weeks ago and he mentioned that they finalized all the paperwork recently to build one in the space currently occupied by the center fountain...not to mention that I personally have seen the plans for it.
For anyone planning on riding the Mystery Mine Ride one more time before it closes, you have until the end of August. Also, Nick Universe will have its grand opening next march, so hopefully all of the rides will be finished by then.