I had an amazing time in the Maasai Mara. This was my first safari, so I don't have any other camps to compare Mara Siria to, but in terms of value for money, I couldn't really ask for more.
I had stunning game-drives. The staff was very helpful in accommodating my personal preferences especially in terms of the time of the drives.
The tents are more luxurious than I expected. I didn't think a tent could provide such comfort in the middle of the bush. The fact that there is no running water, didn't bother me, as the staff filled up the tents reservoir with hot water on demand. So you can practically take a shower any time if you wanted.
If you want to keep an emphasis on nature and don't need infinity pools and electric fences in the midst of the bush, this is the right choice for you.