I found the paper extremely exciting at first but perhaps it was made a few years back - the design of the packaging certainly seems outdated. The first time I used the paper I ironed for ~2 minutes and the indicators had still not completely turned brown but the image itself was burned, as was the shirt itself, leaving a nasty orange stain over the image. However, the image quality was very good so I endeavoured to try again.
Since I've printed around 5 different shirts and only iron for about 1 minute at the very max. The quality is great and I've impressed a lot of friends with my witty and original designs ;) However I have two major gripes with the product:
1) The 'background' on which no ink is printed still leaves the glue on the paper which is very rigid and hard. Unless you cut around the design within >1cm, it leaves a weird stiff effect that is neither comfortable or visibly appealing.
2) The surface of my iron is left with a slightly browny, sticky substance after ironing the paper, which takes AGES to get off. Perhaps my iron is TOO hot...
Overall, I am happy with the paper and I continue to print designs, but it is by no means 'flawless' to quote some reviewers.