Sounds like if you take them up on their offer you'll be all set to for a cave class on your next trip down, at least through Intro. Essentials is Essentials, as far as I know--there is no difference between cave and tech at that level. With 4-5 days of that kind of training, I think you'll be impressed as to how much your skills improve. You should definitely come out with good trim and a solid back kick, and you'll have a blast too.
I'll be getting into Playa on Tuesday afternoon and will stay until the following Wednesday, so maybe we'll cross paths. Nando is going to be seriously messing with me in my advanced sidemount class.