In terms of value for money, the Stohlquist AMP Dry Suit beats the Kokatat Meridian hands down. Fabric quality is excellent, and will keep you dry while letting the sweat escape, the waterproof zippers slide with ease, the neck and wrist gaskets are water tight, and the reinforced knee pads give you confidence they won't rip on rocks or on the beach.
Best of all, the price is half of the equivalent Kokatat suit. If the first one you get strings a leak, then then throw it away, buy a new one and you will still be saving money compared with paying to repair your Kokatat Meridian (I speak from experience here).
The one thing this suit doesn't have is style. You can't order a customized fit to measure, like you can with a Kokatat suit, and the black patch around the neck is ugly, and tends to get hot in the sun.