I don’t have direct experience with the SRT but I have an Anthem MRX520. ARC works very well. I’ve found it more accurate and pleasing to my ears than the lesser versions of Audessey I’ve used over the years. It’s not as ultimately sophisticated as one can get with REW but it only takes a few minutes to run and requires very little/no knowledge or technique vs. REW is a real investment in learning to understand the data gather let alone to make adjustments based on it.
That said, I’ve been very happy with the convolution filters I’ve created in REW for use in Roon DSP.