:).
After Almost Successfully Training our first around age 26 months (and trust me, Almost Trained is much much worse, because they Usually stay dry ... but then not always, and you NEVER KNOW WHEN they WON'T, ARGH!!!!) ... which then lead to about 18 months before she really was reliable ... I waited for the next two, and am still waiting for the last, to show me when they were ready!!! #2 and #3 were a couple of months after 3 years old ... I had a friend, as we were (somewhat anxiously) waiting for #2, who told me she waited until her first was ready, and he went to past 4 yrs (making it not OK to have him in preschools, so that's something to consider too).
We got a Potty Pal seat that installs on a regular toilet ... no more stuff cluttering up the house/bathroom, and I really just didn't like dealing with the poop in a pottychair situation. I love it, and the kid-sized part of the seat (it has a lid, a kid seat, and a grownup seat) is small enough that no kid has yet ever feared falling in). I really love this product--but it's a little hard to find (in Portland, only the diaper delivery service is licensed to sell it).
If I was starting a family now, I would do the diaper-free thing ... but I didn't hear about it until #3, and (being now divorced will explain why) I was under too much stress to get my parenting that together at that point ;). (SIGH.)
No doubt my daughters will be totally uninterested in trying it and I won't be able to live vicariously through them when they grow up either, darnit ;).