Seeking Honest Opinions: Your Experience with McIntosh Audio Gear

I think this will depend on which Mac gear we are talking as the Tube stuff and SS stuff are different.  I can talk a bit on the tube equipment that I have, I have a C2700 preamp and MC275 power amp I had a SACD player up until a few weeks ago when I sold it. 

1. Sound Quality: Not warm anymore, rather neutral. very three dimensional sound, great sound stage width and depth,  bass is controlled, layered and surprisingly detailed. Mids are great over all, good tone, good detail, maybe a tad dry with factory tubes (JJ tesla). Hi's are extended and clean sounding not overly bright but not laid back as the older Mac's were. I suspect ultimate detail is not as hi has the SS due to tube limitations but i don't notice. Tone is good but maybe a little leaner then expected with the factory JJ tubes some upgraded tubes make a big difference. quiet no background noise at all (even with 105db speakers) usable volume range even with hi efficient speakers. 
2. Build Quality and Design: design is traditional Mac you either like it or you don't but its stable and has been similar for decades. Build quality as you'd expect for the cost. quite nice if I do say. 
3. Value for Money: I think the value is quite hi compared to many similar priced manufacturers. Higher then most I think, considering what you get for example in the preamp alone for features is well above what anyone else offers at similar money. Mac also enjoys one off, if not the best resale value out there in audio. 
4. Customer Service and Support: Excellent as expected from a large company like Mac. 
5. Overall Experience: I was never a mac Guy until I owned mac now I'm a fan of the sound for value proposition, its higher then most in the audio industry at these price points. 

well that's my 2 cents. I have not heard the new SS mac gear so can not comment on that. 

cheers. 

About four years ago I worked for Magnolia at Best Buy and got to hear pricey Mac electronics paired with KEF Blades in a dedicated room just for that system.  I’d heard the Blades before at shows and found them to be very neutral and natural-sounding transducers, but the Mac gear made the Blades sound like mush with my audiophile demo material that I know very well.  It was overly warm and the top end was veiled and rolled off and sounded nowhere near as good as what I heard at shows.  Very disappointing.  Maybe the Mac sound signature has changed over the past four years, but I kinda doubt it and would approach with caution.  Just my experience FWIW.

i haven't listened critically to mac gear since the 2010s, and i do recall it sounding warmish/mellow at the high end--i can't opine as to sq of their current stuff. i will say, per @glennewdick above, that its resale value is off the charts--i don't know any other brand that comes close. which on a certain level makes it a very good value, since you can always resell what you don't like, often at a premium.

I have had many Mac pieces through the years

integrated Separates and Tubes.
I love my MA 252 great for vinyl and steaming smooth sound.
My bedroom set has a MAC 6700 perfect for what I need in that room

have been very impressive. I would say get a preamp if you are going to use a MC cart.
As many have mentioned the resale value is high and rather easy to sell.
Build quality is high and customer service has been a pleasure to deal with.

Can't beat MAC on price/value ratio nor for resale and service. Sonics and and build quality can be bettered but only by EXPENSIVE stuff like VAC or Boulder etc. I recently heard the top of the line preamp and it is one of the best preamps I've heard including price-no-object competitors, if you were looking right now that preamp would be near the top of my recommended audition list.

FYI I own Gryphon electronics.