IMHO, JLCPCB has a unique vertical and offer a solid product at fair pricing but the process restricts complex PCBs (ie. via in pad; blind & buried vias, etc.). Perhaps this will change in the future. They also hack / cross-cut our carrier strips on our PCB panels. In short, fair pricing for the products & services they provide.
How complex is your job ?
There are many other shops like Suntak / Fast Turn PCB / Fastprint / Jetpcb / Kingford / Yaxinda that offer higher grade products but you will pay a higher cost, respectively.
We have done the highest volumes with Suntak and they are a solid PCB supplier. Our minor complaint is that the silk screening could be improved but we are anal about such things. Kingford & Yaxinda have excellent silk screening support.
So varying with your needs, you may want to consider alternate shops. One conversation to note is that many shops in Asia are without company names - we were requested by one trading company for us to exchange company cards for the purpose of stating that we have an agent in Asia and vice versa. He also stated that if ever we need onsite visits for potential clients, the entire staff would greet myself as the CEO / VP of that company in China - that is the trade they requested.
So what I am saying is that, some shops may take the order but may also run across the street to a more capable shop to get the job done. Just a FYI as this does happen. We know this from past dealings where a new shop we met at the trade fair stated that they build for other PCB shops, when the primary shop is over loaded.