Here’s a really good comparison of Royer’s new budget ribbon, the R-10. This one applies to guitar, but you’ll get a really good general idea. Shawn Tubbs is a fantastic guitarist, and just a really cool dude. If you get a chance, check out his other videos. He does some great guitar-related gear reviews.
I just bought a pair of R10’s. In general I am very impressed with them. Anytime I need a thick transient I reach for them. They have been awesome on guitars, overheads and not bad on vocals. They are great on piano as well.