We started with a Rockwood Roo 21SS (same as Shamrock), I *loved* that camper! The kids got bigger, but the trailer didn't, so we moved to another Roo ... the 23SS. I actually prefer the 21SS in many ways; I think it was better quality than our current 23SS. I often think I got a 21SS that had everything go right in the manufacturing process and a 23SS that was manufactured on an "off" day (or period of days). But it's still a good trailer.
Bottom line: The 23SS is still, in my opinion, a top-notch trailer and I'd go with Forest River again in a heartbeat.