Bought 3x kits to re-foam all the mids and woofers in a pair of Acoustic Research AR93s. The surrounds appear to be of excellent quality, but the real gems in the kit are the very explicit and detailed instructions and the inclusion of the 30Hz tone CD for voice coil alignment.
This was my first ever re-foam of a set of speakers, and it went very smoothly. Just follow the instructions and take your time, and your vintage drivers will have at least another decade of new life in them.