We used Sunshine Flyer for our trip in December. We flew in about 8 PM on 12/26 and waited about 10 mins for a bus. The trip to Disney wasn't too bad. The driver was great and it took us about an hour from checking in to arriving at our resort (we were at CBR, with previous stops at AoA and POP). I was able to get this trip on their Black Friday sale, so $25 for two adults was well worth the money.
The return trip on 1/2 was a completely different story. We changed resorts in mid-December, so unfortunately we had to cancel out discounted return tickets and rebook at full price (it was still $16 per adult at that point, so not a huge difference). The real issue came when I got our pickup time a couple days before our departure and the pickup time for a mid-afternoon flight was 4 hours and 20 mins before our domestic departure time. I called and tried to get moved to a later bus as we have pre-check and didn't need to be at the airport 3.5 hours before our flight. After some looking, the "conductor" on the line told me that all the later buses were full and there wasn't any room for us (which I find hard to believe, as I've yet to be on a bus that was more than 25% full). SF blamed this on the SWA meltdown, but since this is the second time we've experienced this with them (we were picked up 3hr 40 min early from our Sept trip), I believe that this is more of a normal practice than an anomaly. Ultimately, we ended up cancelling and booking with Mears who picked us up slightly over 3 hours before as promised on their website.
Bottom line, I want to like Sunshine Flyer, but there are still too many inconsistencies in their service and the new pricing ($19.50 per person) is a total dealbreaker for us. I'm not sure what we'll be using for our next trip, but I can for sure say that we will not be using SF for our return to MCO.