FWIW,
I fix a lot of pople carriers out here,#
Vw very rarely get problems odd balljoint,brakes and exhaust seem to be the most common,
engines unburstable as long as oil and filtr changed regularly, 2.4 na or 2.5tdi, drive very well indeed!!
citroens, massive electrical probs also clutches and dmfs, interiors not long lasting,ignition switches routinely break,
peugots almost the same as above(same company)good old badge engineering+
ford galaxy, not to many problems (older style)new ones dmf again and electrics)
seat alhambra seem to be ok ish but not to many of them around but as its the same as galaxy sharan, virtually shouldnt be to many different probs?
the 1.9tdi seems to be either very good or very bad(head gaskets and oil leaks) so a bit of a mixed bag there,
I very nearly bought a vw 2.5tdi 7 seater multivan, damn good value!! cracking to drive easy to work on, reliable, and economical, out of all this is the one i would buy!!