My dd2(8,yr3) has dyslexic tendencies, and is working with FuzzBuzz as well as standard reading books and it has really helped her. She started out at a small prep school, and I began to dread parent's evening, where I was told (in reception and yr1) that she was lazy and willful (at 4 and 5 ffs!). She was on ORT and just guessed at the words, which I find that the scheme encourages. She was very quick at this and would always come up with a suitable word with the correct first letter, but I knew she was not reading. When I mentioned this I was told it was just one of many strategies children use, but to me she had no other strategy. Anyway we moved her to our local primary school for year 2, and she was assessed with a reading age of 4.5. The school were not sure if this was just bad teaching so gave her extra lessons etc for the first year, and then reassessed. Her reading level had not much improved by SATS time and she came out with a level 1. She now has lessons once a week with the SEN teacher, + extra help during lessons, and now has a reading age of 9.5 (but I'm not sure how accurate this is, she is still behind her year) and can read things out of context, such as road signs etc.
FuzzBuzz appears to work on the principle of no irregular words, so the children can work everything out phonetically, and very gradually builds up to more complex words and sounds. I think the main thing is that the child learns to read, and it is good that the school is using different strategies for different children. The ORT, although good fun to read (but 3rd time around it's beginning to become somewhat tedious, and as my 4th starts in September I'm hoping there might be some new stories to be had)can disguise some underlying problems.
Sorry to ramble so, but don't worry about FuzzBuzz being for SEN, the main thing is your dd learns to read.