I hate pooty chairs!

I don't like having to clean out the little bucket that they "go" in.
I always use the inserts, that way they don't feel like they are going to fall in. I also like to use a step stool or something that they can rest their feet on.
It's also a good idea to stick to regular underwear, not the disposables. I think it helps them get the idea faster. Once I start I use regular undies while at home and disposables while sleeping or out of the house.
I also just set the timer for every 15-30 minutes and give them a quick try on the toilet. If he wants off right away I let him and try again later. I am also all for bribing, what ever it takes
Just remember that every boy will be different. My first boy took forever, he was almost four by the time I would call him potty trained. My second boy only took about two weeks right after he turned two and he was a potty master.
My youngest (boy) is 19 months now so I will be joining you soon in the wonderful task of potty traing again.