The cost of living is high if you didn't know that already. Just like everywhere else their are nice parts and not so nice parts. Something I think you would be able to pick up on rather quick. Pomona is close to a few major freeways so getting to just about anywhere is easy, except that traffic sucks nearly all the time during rush hours where a 30 minute drive can take 90 minutes easy. Trip planning is vital if you want to get away. Traffic in my opinion is the only thing that I can think of that is a real drawback to living out here. Your close to the mountains, not too far from the beach, and a desert adventure is only a couple of hours away. Their are plenty of attractions, Disneyland, Knott's Berry Farm, Magic Mountain, two Major League Baseball teams, one NHL Hockey team, two professional basketball teams just to name a few. Oh yeah, no snow and ice unless you go looking for it, and it hardly ever rains. If your into golf, it's all year long. Plenty of off road trails too.
Someone help me if I left anything out.
I was born and raised in upstate NY, and as much at that is still home I don't think I will ever live back there again.
Hope this helps.