Be sure to do the math! Go over your rides for the last several months and see how many you have taken, and how the prices you have paid compare with the subscription price. That is the only way you'll know whether a subscription makes sense for you.
The math works primarily for people who use Lyft to commute back and forth to work at least several times per week. It's for 30 rides, which is one a day, and you get rides with fares up to $15. If you don't do that many rides a month, OR if your rides are typically shorter and less expensive, a subscription will end up costing your MORE.
Also understand that it is a subscription -- they will bill your credit card every month whether you ride or not. If you find it not worthwhile, you have to cancel the subscription or you keep paying...and that may not be as easy as you think. I'm having a problem right now with a subscription (Fabletics), and I've had to tell my credit card company to just block them from ALL charges on my account because they say they're canceling, but they don't.