Yes you'll not get another unit, except for the large Earthquake model which is more expensive, that does the low hz anywhere near as well as a large BK. Like I said before, if you can only get one unit, get that one, because it destroys any other unit at low hz, which is important for sim racing, and it also does reasonably well up to 100hz. You will still feel it up at that range. Once you have one of those, you can feel comfortable adding either a TST unit that matches your budget, or even a couple of Dayton BST-1 / BST-2 units for that higher end. They do surprisingly well from a small amp and mounted to the seat, give excellent feedback to compliment a large BK unit.
In a way, I honestly don't really see what the TST units do better than a BK LFE / Concert + a couple of the larger Dayton units listed above. For the price of a single TST 429, you can have a BK LFE, 2 x BST-1's and a small amp to power them. That just leaves something like an NX1000D to power the LFE. Much better use of funds in my opinion.