Mac amps and preamps need to match well with whatever speaker you choose. I had a MC 7270 amp and MC C37 preamp driving Thiel CS3 speakers for over 20 years, starting in the late 80s. That was a wonderful match. I hated the weight of the amp, but Mac gear is very reliable and if a good match to other gear, a great investment. If you like the looks and sound of Mac gear, go for it.
Years later when I tried using the amp with Maggie speakers, the charm wasn’t there. The protection circuits at higher volume kicked in giving off an awful artifact I couldn’t live with. No longer a good match. I easily sold off my Mac gear for a very good return after all those years. Given my long use, I’d classify it as an effective investment.
I was an enthusiastic audiophile when I first bought the Mac gear, and I’m still one today, although I’m running very different gear (< 10 pound tube amp). Audiophiles do buy Mac, but many buyers don’t necessarily swim in these sites. They buy and enjoy, long term.