At this point, wait for some reviews. A number of us have ordered the new "faster" RunCore parts (faster write, slower read than the existing STEC parts, and will post our experiences, both benchmarks as well as "feel" here once we get them.
I wouldn't buy anything other than an MDD Runcore SSD
at this point either, since the earlier MDD parts are generally perceived to be too slow, and Dell now has 32GB STEC's available.
The original STEC parts are 75/15 (read/write burst rates in Mbps), and the new MDD Runcore parts are around 60/40 according to the testing at jkkmobile.