I think they are a pain to do, but look neat. I'm doing some right now. I need finished 2.5" HST. I cut two pieces that are 3", then eyeball a sewing line 1/4" from the diagonal, right sides together. Then, I cut down the middle, THEN I take them and trim them down.
This is the slow part and the pain part, but it makes everything look so nice, and it works.
I've thought about trying those thangles, etc., though.