Trying new cabs - I wish I could. The challenge for me is finding a good variety to test. I live a little more than one hour north of NYC and checking with the local stores they all stock plenty of the following new cabs:
Fender
Ampeg
Hartke - Mostly Sam Ash
Phil Jones
Then there is the rare appear of these in cabs or combo form:
Peavey
Orange
Markbass
Trace Elliot
Quilter
And rarely does anyone near me (that I've been able to determine by calling in advance) stock these:
Aquilar
Trickfish
Bare
Mesa Boogie
Darkglass
Everything else.
So - I either hear it in the wild (which is the case with the compact Peavey Headliner I heard someone play on a boardwalk gig), or get lucky and find a used one to try. Other than that, its all searching on Youtube with a good pair of headphones and finding reviews recorded with good mics.