Harris is the best, but they also cost more. Very happy with a cheaper brand. I had a cheaper brand the first time I went p-dog shooting, and I lost a boltthat holds in one of the arms. I realise it was my mistake too, but I was not happy at the time.
As for mounting I have a synthetic stock and it doesn't work well on it, but my Gunsdtocks inc. forarm I have works excellent. I would think its more because that forearm is floated beter and the wood is more stiff than the synthetic.