FionaJill,
I would say he is neither "lazy" nor "not ready". I have TTd 3 boys of my own, all at about age 2- 2 1/2, and taught parenting classes. This is always a popular subject. If he can go when you take him, then he is 95% there, because that means he is capable of control. Lots of kids plateau at this stage. At first going in the toilet is fun and interesting, but then they realize that it is something that is going to interrupt their activities for the rest of their life! It's not going away!

There is a point in keeping it up, even if you have to remind him to go. If you persist, he will probably click over in 3-4 weeks, probably even less. I would suggest not using the buzzer, unless you want to use it yourself, to remind yourself to remind him. It will only annoy him. Try asking at transition times: when he gets up. Before breakfast. After. Before getting dressed. Before going outside. Obviously, don't ask after he gets dressed if he has just gone before dressing Just stick with it. I know it's not easy.....but that is probably the most important part.

Try to think about it this way, every child requires different assistance from you at different times. Some breastfeed well, others need lots of help and persistence. Some need to be encouraged to play, others have to be dragged from the park when it's time to go. Some struggle in school and need you to go over spelling words, others complete assignments at school and never bring anything home. So, this is just one way that this child needs you now. As you said, your first was different and probably your daughter will be different yet again!

Glenn is probably too young to be motivated by a sticker system. They work better with children at early school age (5-6).
Does he have to go in the loo? Does he know how to go standing up? Are you OK with him going outside on the grass? Most boys think it is absolutely hilarious to wee all over flowers, shrubs, off the edge of the deck, or whatever. My 3rd is 2 and 1/2, and his preferred place to wee is in the back yard. My husband also gets him to go on the tyre before getting in the car. (I wasn't super-keen on this at first, but honestly most goes in the road under the car!)

Yes, it's harder when they don't care about being wet. Whilst most kids don't like it, there are a few who could not care less (even if they are pooey). My oldest was like that.

About the carpet: a nurse friend suggested filling a spray bottle with 50% white vinegar, 50% rubbing alcohol (isopropyl alcohol--from the chemist). When he wets the floor, wipe the carpet with a quite wet cloth, then use the spray and wipe it in. The vinegar will take care of the odour. The alcohol will help the wetness evaporate rapidly. This works like a charm. I've had a bottle around the house for the best part of 12 years (wonderful for vomit too....). Once he is fairly reliable, then have a good shampooing done.
Don't lose heart! Moral suppport availabe here anytime.