So, now having a few games under my belt, and not being able to find any relatively recent threads discussing this list, I thought it might be worth posting some of the thoughts I've been having about how the list works (or in some cases, doesn't). I realise that the list is effectively set in stone for the next year, but there are a few things I feel worthy of discussion (if they've already been discussed, I'd love some links to where; as I said, I've been unable to find any recent threads).
Firstly, and most importantly I think, Vypers. In short, their use seems far more limited than it should be. Vypers are supposed to be mobile weapons platforms, and Saim-Hann is supposed to make a lot of use of them, but I'm finding it hard to give them a place other than generating BMs from their token firing efforts. Adding one Vyper to a jetbike squadron is fairly standard practice for most Eldar lists, but beyond that they don't feel particularly useful. In every case I can think of, I'd prefer to have jetbikes in my Windrider/Wild Rider troupes: the single 5+ shot at 30cm just isn't as useful as the Jetbike's 4+ FF. I'd like pure Vyper squadrons to be viable as a mobile firebase, but given they'll normally be doubling, the average one hit from a troupe just isn't worth the 200/250pts you pay for them. I'm not entirely sure how this could be fixed: increasing the range of their weapons might make Advances as sometimes sensible alternative to Doubles, and increasing the power of their scatterlasers to 4+ would probably be effective, but would feel out-of-character with Scatterlasers everywhere else in the list.
In a Saim-Hann list, 6 Vypers in a Wild Rider Host costs the same as 5 Falcons, but the Vypers are no faster, probably more vulnerable (better save, but on a LV), and far less effective at shooting.
The other issue I have with the list is the replacement of Vampire Raiders with a 2-for-500pts squadron of Vampire Hunters. Firstly, it strikes me as odd that Raiders aren't available for use: although Aspect and Guardian Warhosts are required to run with Wave Serpents (I believe this was the initial reason for their removal), it would seem sensible to allow them not to do so if they begin the game in a Vampire Raider. As it stands, Saim Hann is the only Eldar list other than Fir Iolarion not capable of launching Air Assaults: this certainly makes sense for a Titan Clan, but less so for a hit-and-run Windhost. Secondly, and more practically, the cost of the squadron makes Vampires hard to use at 3k. At 500 points, there're only two options in the list that could cost more to be the BTS: Revenants (can't be taken alongside Vampires at 3k), and large Wild Rider hosts, meaning that unless you feel like a tooled up Wild Rider Host, your Vampire squadron may well be your BTS. Allowing them to be fielded 1-for-250 points or similar (or even 1 for 275, 2 for 500) would let Vampire Hunters see the table far more often.
Other than those two things, I've been loving the feel of the list, and would like to thank those who wrote it

.