Actually, I think they are very reasonably priced. Are you saying that they are higher than Accu-strut and Har-bar? That's new, they were the lowest priced ones when I bought mine. I've had one on my Mini-14 since they started making them and I think it works perfectly. It especially ends the gun's tendency to start stringing the shots out when it warms up after a few rounds.
The folks at Mo-Rod are 1st Class and the shipping is very fast. Mine arrived within just a couple of days. They stand behind their products 100%, if you have any problems, just contact them for a fast resolution.