Hope it works out. I used a simple suspension seatpost on my hardtail mountain bike back in the 90s and it worked ok. I wasn't a serious cyclist then but I do recall it smoothed things out on the trails. Definitely pogo-ed a lot.

The modern designs look promising, but I cannot get myself to accept the weight penalty. My buddy has the Cane Creek and he loves it. Says it feels like he has a rear flat, and that's a bit distracting.