The Suntech Keiryu Special 53 is indeed special. They "Suntech GM Suikei Keiryu Special" had been discontinued by the time I was first introduced to Suntech. I was able to purchase some of the last few Keiryu Special 39 rods and immediately fell in love with them. They were just exactly what I was looking for. Although they are keiryu rods, I thought their action made them excellent for tenkara fishing. They have a nice progressive bend profile and a slightly faster action than most tenkara rods. The tip sections are a bit softer than most tenkara rods, while their midsection is just a bit firmer.
Two factors prompted me to ask Suntech to bring the Keiryu Special 53 back into production. Interest in two handed rods had picked up, and Suntech discontinued the Suikei ZPRO 54. The Suikei ZPRO 54 was a three position zoom rod, with essentially the same three lengths as the Keiryu Special 53. It was wonderfully light and I liked the rod a lot, but its maximum tippet recommendation was 8x, which many people felt was just too light.
The Keiryu Special 53 is rated for 6X, which will be adequate for the size fish most people catch.