I have used 189 at least a dozen time. The slowest start I have had was around 40 to 48 hours when pitching in the low 50s and I didn't bring the yeast down to pitching temps after rehydrating. I'm sure I shocked the yeast slowing them down!
I had a crack in my fire box due to heat. I went to my local BBQ store they had me send a pic in an email with when and where I purchased it and they got me a new one under warranty and shipped it to the store for free no questions asked!!!
I like to use a 2.5 gallon BIAB batch as a big starter and repitch my yeast into a 10 gallon batch. I like to make Smash beer to understand all my malts hops and yeast. This size of batch works out perfect for pitching 1 vial of yeast and then into a 10 gallon according to Mr. Malty.
I have use this yeast in 2 beers I made a starter for the first batch and repitched more yeast in the second batch. The first batch I kept @ 66 degrees and the second batch I kept @ 70. I liked the higher pitch rate with the higher temp IMO.