My mom and sister hopped on the band wagon recently - my mom has hair somewhere between tailbone and classic, probably (I don't pay that much attention to her exact length, I just always think of it as long!) and she can make some really sleek looking updos with her natural tapered ends (and she always ends up saying "oh this? I just sort of twirled it up in a hurry!") and an extra large flexi 8.
My sister has hair about shoulder length? Maybe a little shorter? It seems short to me, but it's technically probably "Medium" length hair by most people's standards. Anyway, she loves her flexi-8s too. She uses medium for a ponytail, and extra large for a sort of twisted updo thingie (it works really well since her hair is recently permed and doesn't slip like it used to).
I like the smallest ones (forget the actual name - tiny?) for a tiny little bit of hair clipped on top of my head. I like the "extra small" size for a half-up style. I haven't been able to make a ponytail yet, I'm not sure my hair will make a ponytail, because medium was too big, extra small was too small, but perhaps small will work. Also the extra large ones are good for buns and stuff.
So basically they're good for lots of different hair types and lengths.
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Goal: tailbone
Current: waist
Routine:
Detangle thoroughly before washing.
CWC, using a rotation of conditioners and shampoos (not really picky) every 3 days or so.
Comb out thoroughly with a wide tooth plastic comb in shower.
Post wash products: Oil (jojoba, coconut, or sweet almond), Infusium 23 Repairologie leave-in (I put mine in a spray bottle), and a silicone serum.
Oil once or twice between wash days.
Sleep braid every night.
First pic: Natural state in august 2008, second pic is braid waves and scrunchy curls in April 2009, and third pic is "natural" state (combed out and air dried with my usual products).