Pros: Absolutely beautiful. From looking at payback, you've greatly improved, I can't stress that enough! The amount of details in this map is astonishing, and the map runs so smoothly. I foresee the next official community map. The map has inspired me and given me ideas for my map :P

Cons: I haven't found any real cons, which is great considering that this is still in beta, but there are some small things I'd like to point out:

I showed you this before, near the spawn the prop fading is a bit messed up. You are not able to view the pipe crossing until you get closer. Just a small fading problem, easy enough to fix.



A small crack in the displacements near the BLU spawn. It's right across, to the left of where I'm standing in the first image. If you need more clarification, I'll do my best :P

I have a feeling you might not be able to sew it, so just cover it up with a prop, it shouldn't affect it too much.



Prop shadows need to be disabled. You see the first screenshot? In the building to the left, right in front of the entrance.



These props should probably be fixed or removed. This is near the explosion, in a room at the top. There are no backfaces on the models, so they should only be placed against the wall or else it would just look odd.



This is the small side building right near the exit from RED spawn, at the end. Need to raise the displacements a bit



Improvements: Look at cons, that's all that's wrong with this map really.

Notes: I can't really comment on gameplay, as I have yet to play this map on a full sever. Once more people show up on yours, I'll join in and update this.

EDIT: Ok, I've played the map with other people on your server. The map is very fun to play. My only concern is the chokepoint you were talking about. That is a really bad one. My team was stuck there the entire time. Try adding more paths to get out from there. Some underground tunnels.

Pros: The quality is very sharp and clean, very nice.
Cons: The particle colors.
Improvements: It would have been nice if the particle colors had been changed. I know you said it is Valves fault, but you should have waited until they fixed the problem before releasing the skin. Right now, it looks like slurm inside of a duff can.
Notes: I will be downloading this. Keep up the good work.

Testing CSA

I've uploaded this to My Server. I will test it and assess it when I get a chance.

I can probably keep the map running 24/7 for a couple of days so that others can try it.

Just one thing I noticed from the 5th screenshot: The track looks odd just being so close to the wall, bring it more to the center for the next beta.

Pros: This is actually a very interesting looking map, the theme something new that we haven't seen before in TF2. The layout overall is pretty balanced.

Cons: The textures you've used don't really fit the theme of the map, and they get pretty repetitive seeing as they are on all the buildings.

The floor texture should be changed up a bit, make the floor a better quality sand texture and displace the floor ta add a bit more details.

The architecture also is a bit bland. Other than the domes that you have on the roofs, there's not really anything else that's appealing.

Improvements: Add in a 3D skybox, it will make the map look a lot bigger than it already is, and will really make it look better.

Change around the textures. I know you're limited to the default content, but you should still try to use the RED/BLU textures so that players are aware of which base belongs to which team.

Add some more props on the floor... just for the extra details and maybe some cover. You should also consider adding decals.. mainly the RED/BLU ones to define which base is which.

Notes: It's not a bad map overall, but it could be a lot better. I really like the idea you have here, but you should probably consider using some custom content to make it even better.