I have used several seats and the Britax Frontier Clicktight Harness Booster is by far my favorite seat. We currently own 6 of them! They are easy to adjust and have high max out weights/heights. Even better today they are on Amazon's Deal Of The Day. If you are looking for a new harness booster look no further. Head over here and snag yours for only $195.99 (reg. $279).
Also, check out more Britax gear deals here.