Transcend's decision to disable RAISE on the SSD720 was a good one in our opinion. The minute chance that a single chip will malfunction does not outweigh the advantage of having the extra 8 GB available. We assume of course that you frequently make back-ups of your data.
The choice of Sandisk memory chips seems to have little impact on the performance. In some benchmarks the SSD720 performs very well, such as in PCMark Vantage, while in others a bit below average. Performance-wise this is a bit of a dime-a-dozen SandForce SSD. The price is a little on the high side, as most SandForce-based SSDs are more affordable. Especially since Transcend has made the 8 GB available, the price per gigabyte should be lower instead of higher than average.
It makes the Transcend SSD720 128GB a good SSD, but one for which there are more affordable alternatives.