Hi, there. What is the difficulty level on these DVDs? I found the Fit Tower DVDs pretty beginner-like and nothing one couldn't get (and get more thoroughly) from other Cathe videos, so I'm hesitant to invest in a bunch of new equipment if it's not going to be tough enough. In case it helps re: my tastes, regarding strengthening (as opposed to cardio) nothing beats X-Train's strengthening workouts, but I do also love Great Glues, Turbo Barre, and Strong & Sweaty's Ramped Up Upper Body. I like the Perfect 30 Pumps, Lite's Stacked Sets (upper and lower) are good for light days, and S&S's Total Body Giant Sets is fine. Only loved To the Mat: Legs and Glutes from ICE and no strengthening in Ripped with Hiit. I do use the two bands workouts (Travel Fit and Lite's Body Weight & Bands) but only if I'm sick or super tired--I don't find either challenging enough to use routinely. Is Boss Bands going to be like the previous two bands workouts or significantly different?