Been thinking about getting Yankees season tickets myself. How would you consider their service and overall value?
It all depends on why you are considering them.
If you are considering buying a full-season plan and think you will be able to sell 3/4 of them to pay for the 1/4 you go to, plus the playoffs, don't kid yourself. Those days are long gone.
The secondary market is flooded with regular season games, many seats going at the StubHub resale minimum. It's a buyer's market in this respect.
While there are some games that can fetch a premium on resale, those are few and far between, and are likely the games you want to go to yourself.
If you are considering a partial plan to secure "face" value playoff tickets, then you need to do some more thinking. How many games will you attend? How many games will you need to sell? What days of the week do you want to go to (regular season) games? This is all important, because only full, half, and quarter season plans get invoiced for playoff tickets at "face" value. These plans are every, every-other, or every 4th home game, and therefore the "day of the week" changes. The "day-of-the-week" plans (Friday, Saturday, Sunday), and the turkish bazaar 12-game plans, only get you access to the pre-sale, with a pin-pong-ball chance of getting into the pre-pre-sale. (To be fair, full playoff strips have been offered to the 16 and 12 game plan holders, based on seniority; the cheap GS strips are have been gone when my turn has come up.) I don't think the 11-game value plan qualifies for the pre-pre-sale.
I put "face" in quotes, because even though the face values of playoff tickets are published by the team before they go on sale, there are difference "faces". There is the full season price, the partial plan price, and the single-game price. The strip price depends if you are invoiced for it via plan rights, or you take an plan-holder opportunity to buy it outside your plan rights as an "extra". Then there is the whole dynamic pricing scheme, where the cost of the ticket will double if you don't win the pre-pre-sale lottery.
The Yankees make money selling tickets. They don't want you to make money (re)selling their tickets, and rig the system accordingly. Buyer be(a)ware.
As far as customer service, I typically get a new rep every other year, and have never had a need to contact mine. I do get emails, as posted elsewhere, when my rep will be out in the stadium pre-game to take questions. My rep emailed me to ask if I would be interested in adding seats for next season or upgrade, because he is looking out for me and wants me to make sure I get access to the best available inventory. Take that with a grain of salt.
For the record, I have a 16-game Friday Plan in Row 4 of 413. I am in a price-break section, and in an uncharacteristic low-row. I know there are no seats closer to home plate in my price point (GS Outfield) for a 16-game plan. I won't be giving up these tickets.