GTI is the lower end model where it is still full size but affordable.
GTX is like the Caddy. Lots of goodies and a nice riding hull with a very comfortable seat.
The RXP is the race car. Older models have no goodies beyond manual reverse but it is a FAST ski and has a special cut hull
The RXT is the 3 seater version and has a S3 hull which is a deeper V and designed for chop.
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