I've an old pair of Volkl G3s that I use for local skiing in the mid atlantic where renting is a big PITA. For western trips, I like to take my boots and rent the skis given that snow conditions can vary from day to day. This year, i took 2 western trips, 1 to CO and 1 to UT. In CO, snow conditions were pretty much the same for the 3 days I was there, and I was skiing with buddies (more aggressive skiing) so just used 1 pair of demos that worked really well. In UT, we had a day of big powder, a day of more powder, then 2 days of spring skiing with variable conditions. I spent the 2 powder days skiing more offpiste and aggressively so I demoed some elan spectrums wide underfoot, which were a perfect tool for the conditions; the 2 spring skiing days I spent with my 9 y.o. skiing groomers so demoed a pair of nordica nrgy 80s on one day (hated them, 1st time I've every really not liked a ski), then some K2 something or others on the last day, which were great for the conditions and skiing I was doing. For those reasons, I like to demo when I travel rather than carrying my own skis.
Ironically, we do transport our daughters skis on trips, because, well, they're blue and pink and she likes them. So, I also take my ski poles.
Kind of a weird mix but it's been working for us for a few years.