I liked Thangles okay - still have a bunch of them plus a kit for making an Orion's Star. It's great that there is one size you can buy for jelly roll strips. I really liked that aspect.
I have also tried various templates and those work fine, too - as long as I have the wiggle room to trim the finished squares to the size I need.
I would rather use Triangulations, though. I print them one or two sizes larger than I actually need, then trim the pressed squares to the size required. There are some similar printable pages in a few sizes on the internet and those work just as well if you can find them in the size you want.
The big advantage of Triangulations is that the bias doesn't act up as much when you're sewing two heavily starched pieces of fabric together and then cutting the pieces apart. Starched together and pinned to the paper and sewn with very small stitches, the bias doesn't even seem to come into play. I guess the next stop would be a sledge hammer or a club - beat the dang stuff into submission. :mrgreen:
Triangulations is just a very large collection of pdf's for printing HST's, QST's and Flying Geese. You print them out, pin them to your fabrics, sew, cut apart and press. The HST's are done in 1/16" increments, so you should be able to always find exactly the size you need for any quilt.
I bought the Wonder Ruler and the Lazy Girl's No Math Flying Geese Ruler, too but I haven't used them yet. They're in my ruler rack with a bunch of other still-in-their-wrappers-rulers. :?