"Normal-looking offspring were obtained from all four strains tested."
Link from article http://www.biolreprod.org/content/early/2013/06/25/biolreprod.113.110098.abstract)
One scary a$$ line, indicates a 100% success rate.
You should re-read the abstract to see what it is really saying.
The end result is that they were able to get normal-looking offspring from all four strains tested. However, there was an excessive number of failures in the process in order to get that process. The important line over-looked indicating what it took to get those end results: "cloned offspring were born at a 2.8% birth rate". If you check table 1 of the full article it shows there were a total of 651 embryos cultured in order to get their end results.
This is very far from a 100% success rate.
The aim of the experiment was to see if a clone could be produced from more commonly available cell types. This was a desirable aim due to the fact that it would be less harmful (and/or painful) to the donor than other methods of harvesting material for cloning (which may result in permanent damage or death to the donor).
The viability rate for this method of cloning is still no greater than any other method of cloning in use. It's simply a more humane/ethical method of cloning, nothing greater.