RSVP Kingz is definitely a good site. They are trustworthy and do take pride in their excelling customer service. I have used their platform many times and for the most part have been successful. I haven’t been using them too much anymore lately because their prices have inflated dramatically. Most of the time the price of the slot plus retail is the same as after market prices and sometimes even higher. A release that would have cost $30 a year or so ago is now costing $60-80 and I’m just willing to take my chances with after market prices. Although this site is my favorite ATC service, I’ve been taking my business elsewhere for the sole reason of pricing.