I have a G4 that I have exactly where I like it. But I like a very stiff predictable and precise sled. With that said any version of the G4 or G5 is very capable. T-Motion has just become the canned response. Have spent some time on a G5 and it's nasty for sure. But they still have room to improve. For example torsion springs, you have this advanced sled with cheap torsion springs that add a second element to suspension tuning. The front end needs to be in line also. For me the G5 would still need a bunch of changes for me to get it how I wanted it.