It's good to see a general consensus that Tilers want to use adhesive that is reliable and has good back up service. In fact, I have had great back up from BAL, who have a technical dept that is always accessible, Schluter who took the time to follow up two queries on their products, and Tilemaster who were prepared to replace a defective product without recalling it. Yet, the biggest criticisms within these forums of such companies is that their products are too expensive. So if a retailer is telling me "all the local Tilers are using this cos it's so cheap" I tend to believe him. And as it happens, the Bostik rsf seems to be a pretty good product to use.
One thing I have learnt is that all Tilers have favourite products. I once met Deano who only ever used Mapei. Another tiler from the NE only used Weber. One guy swore that only Granfix was any good. Two Tilers doing commercial contracts would only use Ultra. And almost yet nearly every commercial contract seems to supply Norcross.
That still leaves me wondering how many guys would go for the cheapest, especially in large flooring contracts, where 50 and more bags of rsf can add up to big savings. And that's money in your pocket.