I’ve just done exactly the same thing (sold Hightower frame and replaced with RC529). I loved my Hightower, but I also have a Scott Spark that does me for longer days out.
Always wanted a decent steel hardtail, so this seemed like the perfect bike (ticked all my boxes). I’ve had a couple of rides on mine so far and honestly, it’s a banger!
Feels very direct under pedaling, chuckable even with the dropouts in the longest position. It’s also the most confident I’ve ever felt when jumping on this bike (nervous jumper). Sometimes, I tend to forget I’m riding a hardtail when I go crashing into rocks, so bear that in mind 🙂
For the price, I think they are really good. My missus bought an RC127+ after I built mine up!
They are rated for 130-150mm fork (they ship full builds with 140mm). I run mine with a 150mm Pike and was set to reduce it to 140mm. It pedals and handles so well, I’m going to keep it at 150mm and maybe convert to coil.
I have a 2.35 Nobby Nic on the rear and the clearance was a little close on the seat tube with the dropouts forward. I tried them in the most rear position and could easilly fit my hand behind the tyre (big hands!). Oh and my wheels are 27mm internal width.