It’s important to remember that your results will vary depending on various factors individual to the client, lash length, thickness and whether they have loads of lashes or not so many. We all love to use our best pics that give a bit of wow factor but to be honest if someone has sparse thin short lashes there’s no way you’ll get the same result, no matter what system you use.
I’ve used three systems and would say they are much the same. Just follow timings for your chosen system.
That’s not to say finer lashed folk won’t love it! It’s about managing their expectations. 100% of clients I’ve done (and I do a lot) are pleased with the improvement since they still look brighter, perkier and their lashes look longer!