I've done it twice now and going back a third. Great instructors, and due to about 20 people doing it, they can break you into a group which will suit.

 

Was Camille (from Italy) one of the instructors? One of the best ski lessons I've had was with her.

 

Is this the one you are talking about:
https://www.skiingacademy.com/ski-improvement-course/

If so, totally recommend it. I've done it twice and my partner has done it once.
The only possibly negative thing I'd say is if you are up there with other people and they aren't doing the course you won't really see them for the week. The course is pretty much an all in proposition, all day skiing in the group with lunches together with the group, apres drinks, and evening information sessions.

Positives: You get some of the best instructors on the hill, week long consistent feedback from the same instructor and video reviews (which you'll get at the end of the week as a take away). Plus some great off snow tips on equipment maintenance and ski buying tips.

When I did it the group sizes were ~4-6 to a group and there was 5-6 groups from intermediate to expert, so a range of abilities and speeds to match you up to.

I really enjoyed that it was an "all mountain" course in which we discussed and practiced different techniques and skills to tackle different terrain (and look good while doing it).