Sure have. Always discuss with the customers. A landlord might want low maintenance but cheap as possible and I'm not compromising on my income so I'll use something like Fassa MS 20. Weber OCR once but i like fassa more.
I mesh everything no matter what, its great stuff and I don't see it failing within my lifetime. £8 a bag, more limey than basecoats so i am imagine it breathes better but that's just my opinion.
I don't offer any warranty if the customer isn't going to pay for the full silicone system