The UY we currently have is April. We are about to take our third trip on points and so far, they've all been fall trips. This will all change once our kids start school in a couple more years, when we'll switch to summer. Fast forward another 15 years, I imagine my husband and I will go in Feb, May, Oct. I can't say that I've ever even thought about the April UY in relation to when we travel. The only time it's crossed my mind is when the banking deadline comes up in November.
I don't have any complaints about the April UY, other than not being able to find the right match for what we're looking for.
Full disclosure: we are the second name on the much-discussed and much-disputed direct purchase waiting list for VGF. I verified yesterday that the other direct purchases we've heard about recently were for other UYs. The person ahead of me on the waitlist is also waiting for April UY. I've been waiting 4.5 months and was close to the top of the list when I was added, so I have to believe the April UY is a big part of the holdup. I haven't completely ruled out resale, but direct is still our first choice and there isn't an April UY of the size that we wanted anyway (that isn't totally stripped). I really wanted to have the points in hand to book a Fall 2016 trip, so the clock is ticking!