http://www.smh.com.au/business/seven-shareholders-warned-of-the-perils-of-caterpillar-20100409-ryxk.html
An interesting article reiterating the concerns of many SEV holders regarding the ease and speed with which Caterpillar could end its relationship with WesTrac.
I hold only SEVPC and voted in favour of the change to TELYS4, but I'd vote against the deal if I held ordinary shares.