I used Mementostrip for our wedding.
Their prices are reasonable and affordable.
They serviced our wedding very well. Our guests enjoyed using the photobooth.
The only gripe I have with them is their responsiveness at one point. We were communicating to each other about the graphic on our photostrip. I would let the graphic designer know what I'd like, but I wouldn't hear from her for about a week and I would have to follow up. With our wedding coming up soon, it made me a little nervous. At least let me know the status.
Other than that, everything went well and smoothly with their service =)