Just to answer the actual, original question:
I used (some of) the exact stuff on the Apple-Rise link for my daughter, who started at age 3-1/2. Specific reactions:
- Tip locks. These are kind of controversial, but I think they're useful. Kids of a a certain age just don't have the strength and coordination to maintain a wedge without them. The downside, supposedly, is that they get "addicted" to them. Not an issue in my case. My daughter used them pretty much all the time her first season. She used them one day her second season, then never again. I'm not aware of any particular advantage of one design vs. another, except it is a very good thing to be able to unlock and re-lock them relatively easy. It's very hard to walk in the lift line with your tips locked. After you unlock and lock them a few dozen times, you'll appreciate the relative ease of a some designs vs. others.
- Leashes. I actually got one, and never used it. They don't seem like a great idea, as a pedagogical matter. As a purely practical matter, they may be necessary, at least if you've got one of the kids (generally boys) who are intent on taking big air into the parking lot at the first opportunity.
- The horizontal bar between the boots to force a wedge. Never used it. I don't think I actually had one, but I wouldn't have used it anyway. Not necessary, once you have the tip locks. Maybe if you've got one the aforementioned kids intent on doing gelandesprungs over SUVs. Otherwise, no.
- The handle on the back. Pretty useful, actually, though perhaps a bit demeaning. It allows you to move a kid about like slightly awkward, unusually squirmy, luggage. Useful for loading and unloading chairs and, depending on your wont, cars.
- The bar thing, that looks like and upside-down Eastern Orthodox crucifix. Much more useful than you'd think, or at least than I think you'd think. Anyway, I've never seen anyone else using one, and I'm not sure why not. It actually was kind of terrific, in certain circumstances. With it, you can take a kid down the steep parts of real runs within a matter of days, then leave him/her to his/her own devices on the flat parts. Plus, it's useful for skiing into lift lines in some semblance of unison.