I like these a lot, and I'm glad to hear Vauxhall continue their recent run of form. When I was a wee lad (ish) I had a couple of Cavaliers (H reg SRi and K reg CDi) and I loved them, the latter I took from 30k to 105k miles with no problems whatsoever, I remember it as being a very pleasant, although not exactly sporting(!), drive - lovely car, had a friendly personality! Very unlike every version of the Vectra, all of which leave me stone cold - impossible to warm to on any level, and in the case of the first version, positively dreadful.
I would certainly consider an Insignia, however as a company car driver I've found the lease costs to be extraordinary. I've recently had to order a new car and did look at the Insignia, but it was vastly more expensive than the comparable Mondeo, and right up there in Audi/BMW territory if I recall correctly.
Now, Mondeos are on a par with the original Vectra in terms of likability to me (note that's likability, not ability - my personal opinion, don't rupture something all you Mondeo worshippers!) so I didn't order either in the end. While I wish Vauxhall every success with this car, I hope they are able to offer more competitive lease costs, or I fear the commercial success of this appealing new car may be limited....