iRender

Pros: - love the speed of the instances. you can pick up any server you want.
- pre-installed Cinema 4D and Redshift come with a free license. it helped me a lot as i don't want to install them myself.
- support is superb. they are always online to check your problems.
- if you schedule your render, you can get nice promotions. they are often at the half end of the month.

Cons: - the UI is kinda off.
- pricey, so wait for their promos.
- you should watch their tutorial and follow it each step. or else it's kinda hard to get started.

Overall: Love it. it's not the only option for C4D Redshift rendering in the market, but the hardware and support is the best.

Pros: Very fast rendering. I usually use their 6 or 8 GPUs machine.
The staff is very friendly and helpful. I get advice and support needed anytime and almost immediately.

Cons: The 4090 machine is a bit pricey but I guess it's worth the speed.
It took me some mins to install software in my first time.

Overall: I have been using iRender for over a year. This render farm is very helpful when my deadline is close. It works very well with C4d, Redshift. Easy to use, fast renders, friend customer support.

Pros: I consider that iRender is one of the best render farms in service and support. It's so easy to use, I can set up the working environment and choose the right package to meet my demand. My projects sometimes have custom scripts, great that iRender supports them.

Cons: iRender is not the cheapest render farm but with me, it's fine for security and speed. The render farm that I can trust and always go with.

Overall: iRender is easy to use, good services and support. It's security and fast. I usually use it for projects that need quick completion time and heavy scenes.

Pros: - Easy to use.
- Various packages, easy to choose the suitable package for my projects.
- The support team is very friendly and they support almost immediately.
- You can control the rendering process.

Cons: I have nothing to complain about. You can try it on and let me know your thoughts.

Overall: iRender helped me meet the deadline! iRender farm where I can actively render my project whenever I want. It really is a great solution compared to the rest.

Pros: My pipeline is quite complicated, so I can create 2-3 images for multi task and switch back and forth between each server. The support is great.

Cons: Price! Their price is quite expensive I guess. Some promotion would be helpful!

Overall: Very useful and easy controllable for large scale projects. Will be better if they have plenty of promotion.