They are fine, but they don't make for tidy runs of vacuum lines so I stay away from them. I just run line back to the fire wall and "T" it there where one line goes left and through the firewall where the engine wiring harness hole is (for the MAP sensor). The other end runs on the driver's side where it gets another "T" to feed the BOV and then the wastegate.
All pretty well hidden, simple, effective, and cheap.