I try to stick with basic rulers. If I like a quilt but it requires a special, non-standard ruler, usually I'll pass. Spending $30-$50 on a ruler to use in one quilt just rubs my fur the wrong way. The one exception I made was for the Quick Curve Ruler from Sew Kind Of Wonderful. Those two ladies have done an excellent job of designing a LOT of cute quilts utilizing that ruler, there are so many different quilts you can make using it.
And of course I love the Bloc-Loc rulers, they're totally worth it. Sadly, I heard from a shop owner that the creator of Bloc-Loc was trying to sell the company, some kind of family health issue taking priority. I hope they're able to find a buyer and keep producing the rulers.