Each element on their own is good. (Thomas' bagels are some of the only bagels I can eat plain, because they always taste good to me. PB&J is a classic. Lunchmeat and cheese is also a bit of a classic, and tastes good in a different way.) But they also combine really, really well, if you get the balance right. None of the elements are overpowering, overwhelming the taste buds. Each of them is there in balance, and you can taste them all. The PB&J has slight dominance over the lunchmeat and cheese, but that's okay because lunchmeat and cheese can taste a bit strong at times. But the bagel isn't lost in the mixture.
So it's delicious, and incredibly filling. (Fair warning, you need to be like me and have a bottomless pit of a stomach to eat as many as I did. One or two Thomas' bagels are either a meal or a significant section of a meal for most people; three of them, with toppings, is a lot more than that.) I also had after it a cup of orange juice, and before that (shortly after I got home from kickboxing), I had a glass of chocolate milk.
...It might not be the healthiest meal in existence, but it's better than the alternative: no meal at all, for someone that's got weight issues as it is. "Huh. Weight issues, and you eat a meal like that?"
Yes, weight issues. I didn't say overweight, though. I'm a 6'2" stick, weighing in at a meager 140 pounds. I can afford to eat more than most people, because I need to gain weight, not lose it. Skipping a meal is very bad for me, since it does in fact cause me to lose weight if I continue that sort of negligence for too long. So the lunch I had was really, really good, both for my body and my taste buds. It does take some prep time, and it is a little bit messy annoyingly enough, but it's worth it to me.