The XR 100’s are unique speakers - with 4 bass drivers and 10 midrange drivers.
They have controlled horizontal dispersion which reduces interactions with floors and ceilings.
They will sound different than some of the other excellent suggestions here.
I think it would behoove your friend to audition some other speakers at the same dealer - just to see if he has a preference.
There is one thing the XR 100’s have that others do not - illuminated McIntosh logos that switch on with the rest of the gear.
“If it looks good it sounds good” 
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Main System:
Amati Futura Mains
Amati Homage VOX Center,
Proac Response 1sc Rears,
Three MC2301's for L,C,R
MC 602 for the rears
C 1100, MX 151, MCD 1100, MR 80
Nottingham Dais with Wave Mechanic
Sumiko Palo Santos Presentation
SurfacePro 3, RPi 4, ROON, WW Starlight Platinum USB, Schiit Yggdrasil, Benchmark DAC3 HGC
MX 151, OppO BDP-95, JVC RS-500 DILA projector, 106" diagonal Stewart Luxus Screenwall Deluxe with Studiotek 130 G3 material.
Lake House:
Ohm F, MC 275V, C2300, MR 77, Rega P3
OnDeck:
McIntosh MAC 4300v
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