Mulefire, welcome to the forum! I am no expert in SIKs but I think you will find the SOTs feeling quite a bit different. Because you (and your legs) sit higher, it will take a little time to feel the same degree of comfort in terms of roll stability, especially in sharp turns.
The plastic hull is heavier, but whereas weight might be a transport factor (loading, etc), it doesn't matter much on the water. Additionally, rotomolded boats tend to have some small variation in hull shape precision which plays a small part in speed. Nevertheless, the Revo 16 is an excellent design and can easily cover 5.5+ miles in an hour (in relatively smooth water) with Turbofins -- quite competitive with just about any composite of similar length.
IMO the Revo 16 handles offshore conditions and nasty weather well. It tends to slice through chop rather bob over it.
Two Revo 16s offshoreOffshore buoy, Dana PointNasty day, San Diego bayPaddling, it tracks reasonably well, depending on whether you use the rudder, but does not edge for directional control (other Hobie models do).
For accessories, my top three are standard Hobie scupper cart for minimal lifting (and insertion / extraction on the water), Turbofins for speed and acceleration, and large rudder for improved handling (turning, low speed operation, following seas, etc).
Finally, you mentioned something about accessories and design considerations. Rest assured this boat was designed long before Hobie livewells came on the scene. That cargo well was designed more for touring than anything else.