I have an ebike that has it's battery in the seat post. Because of this I cannot use say a Suntour suspension post or any other that has it's own post attached. I was thinking of trying one of the spring suspension units such as the one one made by Rinsten. I wondered if any of you has tried one, as I read a few reviews and some say that for them, it was not that stable sideways and was also bouncy. I realize weight has a bearing on this so I am including my weight which is 145 pounds. Thanks in advance.