In terms of progesterone supplementation post IVF transfer (pretty much no matter what your protocol is, you'll be on progesterone), the grass seems to always be greener on the other side.
Those that endure the daily PIO shots - progesterone in oil shots which are intramuscular, a big needle and a thick substance that injects oh so very slowly - often would rather they had the suppositories.
Those that endure the suppositories - which are large, vaginal suppositories that have a tendency to leak quite a bit so you're prisoner to the panty liner for the entire time you're on them - often would rather have the shot and just get it over with.
What's my preference. Well. How about just one freaking progesterone supplementation method? I'll take either shots or suppositories. Because at this point, I get both. BOTH.