I would give this 5 stars. Kingston Brass is a NIGHTMARE to deal with if a part is missing or breaks (Ie the nut broke because the brass isn’t the greatest). Unfortunately our plumbing store didn’t carry the compression line to fix the problem but they did carry the nut and ferrule. Wayfair was great but Kingston Brass is awful. Customer service told us it would cost 58 (see picture of the pieces we needed). The local plumbing store  sold the pieces for 1.88. 
Beware of KB pieces. Great to look at cheaply made.