The eBay listing I just looked at for him (one where he's selling 10 units) he's offering free shipping. The only thing you would be risking if you use a credit card and/or PayPal is the return shipping if they turn out to have issues. The reviews seem very good though. The problem is I know if you return something you don't get to right a review. It really biases the reviews. If someone had a negative experience and returned them you would never see a negative review unfortunately.
Either way use a credit card or PayPal. The fees are your insurance premiums
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Currently the listings up for sale are for 8 units but I only want 3 or 4.
I’m trying to strike a deal for 4.2 or 4.3 max for the 4 but it seems that these units are already sold.
You can leave feedback immediately after the auction ends and even if the sale is canceled later the comment will be there unless it's removed by ebay for violating any feedback rule.