This is actually a great program compared to a program like Tmobile's JUMP, which is what I currently have. It is obviously a leasing program, and I find that more enticing because you're technically paying the depreciation of the device, which is fine by me considering what I have to spend with T-mobile. I'm technically on a lease program with them, because I always upgrade to a new iPhone, and I don't care to keep the old ones either. To break it down is simple:
I'm currently paying $10 a month plus my $27 a month for my iPhone 6 128GB. Not only that, I had to drop $200 plus taxes, activation etc with T-mobile to startup my plan last year.
With this program it appears you don't drop any down payment, it's all built into the monthly fee. Additionally, Apple's Applecare+ is much better than Tmobile Jump's insurance. If I break my iPhone with Tmobile, I have a minimum $175 deductible to pay for an incident, whereas with Applecare, it's only $79 per incident.
Essentially, if I get the iPhone 6S 128GB I only pay, $42.45/month, that's $509.40 for the year to lease the device. If I break it, that would cost me an additional $79 to replace it, that equals $588.40.
If I go with Tmobile's Jump program (which to be honest is a lease program in disguise), I pay $200 upfront for a 128GB iPhone, plus $27 a month for the installment, plus $10 a month for JUMP, totaling: $644 for the year ($134.60 more than Apple's new leasing program). If I break the iPhone once in the year, and get a replacement, it's a $175 deductible with Assurant (Tmobile's guys that handle the claims), totaling me $819.00 for the year ($231 more than Apple).
In addition from what it looks like with Apple, you can walk away from the device when you end your year lease, with T-mobile you must pay the rest of the phone if you choose to do that, and now you have to sell it yourself to cover that cost. This is a no brainer, granted Apple is not going to ask for down payments which I HIGHLY doubt since they don't mention it anywhere in their copy.