The turf tees at the Blockhouse are great. The turf tee on Hole 5 at Maple Hill I slipped so hard I almost had to withdraw from the Vibram Open.
I've seen good turf and bad over the years. AS well as good and bad concrete.
I only played the Blockhouse once, and it was years ago (still the Grange then). Assuming the tees are the same, they WERE great. Most of them were compacted gravel, which was super nice, since they'd been maintained so well but obviously needed that maintenance. The turf tees were sublime though.
I've played Jarva too, and I'm guessing that their turf tees are the same as the ones discussed here. They worked fine, some of the wooden frames were looking a little long in the tooth, but I had no issues with the tees. Though, as a disclaimer, it was a hot sunny day so I can't attest to inclement conditions.
Concrete can indeed last a long time (20 yrs is the expected life of sidewalks), but they can also deteriorate, where the top layer of mortar gets worn away and the aggregate is exposed underneath. It's still perfectly sound to walk on, but throwing a disc from it can be downright hazardous. Granted, if the concrete is installed professionally, there's better chance that it'll hold up to the continual wear.
I guess the point I'm trying to make is that not all concrete is equal, and not all turf is equal. Both have their pros and cons, but I will say that the grange grass mentioned earlier has been the best teeing surface I've experienced. I think that they were pretty expensive though, and from a bang-for-your-buck standpoint, concrete was more economical.