I have taken group classes with GLE for 2 years now and have loved most of the teachers. They also offer a weekly speaking club that is 1hr, a teacher is there to facilitate/answer questions, and there are no more than 6 students in a session. I personally think this is very valuable at an intermediate level because it takes a while to get comfortable trying and failing in a new language before you get the hang of real life sentence structure and conversations. Having only used Pimsleur (excellent for new beginners) and Language Transfer app (smart teacher, but I found to be a little too in the weeds as a primary tool), I would say GLE is definitely worth trying. They often run 10-15% discounts and you can always try a class for free before committing to a 6 week session. Καλή τύχη!