Senna's lipsticks retail for $18 which I feel is a little steep, however you can often get their cosmetics on discount sites such as Beauty Ticket.
Besides the price, the only other negative about this lipstick is it tends to have the SPF lipstick smell/taste which is a minor annoyance for me but may bother others more. The vanilla scent is almost completely covered up with eau de lipstick, however it's something I'm willing to ignore due to the fab formula. These are heading straight back into my bag.
Disclosure: These were provided by a representative of Senna Cosmetics. I'm not being paid. All thoughts are my own. I'll most likely be buying more of these with my own cash.