I bought a new 2 battery charger from them recently.
My old one was a 4 battery charger, which works fine, but is just too large for when I travel.
So, it arrived without one of the little rubber feet. Not a big deal, but when I buy something new I'd like it to be perfect. And second, one foot missing out of the 4 on a table top is unbalanced.
I emailed RTD asking about the foot, they wrote right back saying they have some spares and they'd send me one. It arrived 3 days later.
I like that. Are they the cheapest? Don't know, but I'm happy to pay a bit more (and not saying they are more expensive, since I haven't checked) to get quality customer service and products.