I am Plt Premier too. I am finding I get suite upgrades about 50% of the time. In the last month I've stayed at the JW Camelback Inn 4 times. Each time I've been upgraded to a suite. My current stay I've been upgraded to a suite with its own private pool.
Summer in Arizona has its advantages. This stay I'm on the OTP rate so I get my $100 BB and breakfast, I used my elite coupon for a free night and got a suite that in two weeks will go for $459/nt.