I normally splice 8 and 10 mm Bee Line with Brummel splices but I like the idea of a covered eye, so I decided to experiment and see how class 1 double-braid splices would hold up. My layout for the splice was with a 5/16" tubular fid and a long fid bury above the eye. For the cover taper I used the 5-5 Samson double-braid pattern. I spliced and whiplocked the first eye before doing the second eye. To get a 28" prusik cord I cut the rope 39" long as measured from the end of the first eye (41" for a 30" prusik). The test results for the two prusiks that I sent to Treestuff were both nearly identical (10,400 lbs), and the rope broke between the splices, not in the splice.
So, all I can say is that I was favorably impressed by the performance, even though the splices did not meet the specs for class 2 rope. I am not necessarily recommending it to others, and I definitely am not selling to others, but I feel safe climbing on them. If you decide to give this a shot, I would really like to see if you get similar results.