I haven't booked anytime/standard rewards per se, but I've booked domestic first class awards when coach saver wasn't available and domestic first class saver was available and was about the same number of miles as coach anytime/standard. I would've booked saver had they been available, so I booked the anytime/standard cost but I got a bit more from it by getting a seat up front for it.

It was mostly on winter holiday schedules, looking 10 to 11 months in advance (ie, soon after schedule opening), that I saw no coach saver, but both coach anytime/standard and first class saver (on certain domestic routes).