I have the basic 4 Bar and the 4 Play. I can't speak specifically on the 4 Bar Tri. I really love this system. Previously, I had about 6 different LED par cans from Chauvet and American DJ. The nice thing about this system is that it's so easy to set up, and packs up nicely and securely. With regular par cans, it's hard to pack them securely without taking up lots of space. All the gigging took its toll on mine. With this system, the flat nature of the products, and the supplied cases, transporting is so nice.
For small clubs, one of each works fine, especially if you get a good angle onto the stage. I wouldn't mind picking up another for larger stages or places where I really have to put them on the side of the stage.
I have only two complaints. The footswitch controller tends to be wonky. If the pedals are out of alignment, then they don't make good contact, and the lights don't behave properly. It's an easy fix, but I didn't realize what the problem was for a while and it was driving me crazy! You just have to wiggle the pedals to the left or right until they make good contact when being depressed.
The second is that the microphone for sound mode is too sensitive. It's either just a bit too manic or it doesn't move at all. I may experiment more with putting some cotton around the mic, etc.
Still, my concerns are minor. This setup is a godsend for the typical bar band looking to have their own lights. Feel free to ask more specific questions.