My Spanish needed evaluation, but so does the programme itself.
It works, at least for me. For others? Well, they’d need to try it out. You can’t tell just by looking. Or worse, comparing it with conventional language instruction, unless you admit that that serves maybe 1 in 20.
I wouldn’t claim to have accumulated a vocabulary or mastered a batch of rules. Instead, I have a feel for Spanish, a base, a sense of its sounds, rhythms and patterns.
More than that, though, is that I’ve developed a love for it. I wouldn’t want to let it drop. Ever.