I currently have a g15 gen 2 and it's been great for the 4+ years i've had it. That being said, i just ordered a new Corsair k90 to replace it. I've been wanting to change to a mechanical for a while and the Corsair is the only one out there that really met all my needs. As far as your question goes, is the g19 worth $150? Who's to say what something is worth to you, the person that will be using it. Something that is "worth" $150 to one person may be worth $0 to someone else. It's all relative really
Logitech makes some great stuff, i wish they had a mechanical keyboard in the G series because i'd most certainly buy one.