Any more recent or semi-recent experiences with iPrefer? They statusmatched me to Elite (highest tier) and I am looking at booking the Aranwa Sacred Valley Resort in Peru. Currently booked via booking.com for ~450€ + 45€ Cashback and free upgrade to Deluxe Room. Via the hotels own homepage, the iPrefer Member rate is 450€ for the lowest room category (Deluxe Room at 500€). I tried my luck and sent them a friendly email with the confirmation of my booking.com reservation, and that I am a iPrefer ELITE member, and if they would maybe like to match the price (because afterall it would still be cheaper for them, I assume, and they advertising "best price" on their homepage), but they simply did not respond at all now for a week, which I find rather rude - they could at least nicely decline or something.
I was considering to change to the 450€ lowest category room on their own homepage in the hope of a suite upgrade with the Elite status, but with little to no upgrade experiences for the iPrefer program found online I think it is probably too much of a risk and again the hotels behaviour of simply not replying is also turning me off.