agree with Stevie
I have Happy Hour too and I absolutely love it. I did check out 9801 and found it to be quite complex, however, I also found that when I did get the moves down, I did not have enough workout space to do them right - so I traded it.
I actually e-mailed Christi to find out if her new tapes were going to be more like Happy Hour or 9801. She replied that it would be a long time before she made anything as complex as 9801 and that they would be more comparable to Happy Hour in intensity and format. From checking out their description on her website, I think they should be a pretty good workout when they come out and so in addition to buying all of Cathe's new tapes, I have also decided to buy Christi's new hi lo as well. Ka Ching!
And if you are looking for another fun hi lo, the hi lo on 9905 is very fun and a great workout. I have yet to check out the step though but I bet it will be fun too.
Hope this helps.
Kim