I have 6.5.x with Rhodium 2012 manila (no extra tabs) and sprint stock dialer.
Portrait dialer 100 %
Landscape is not so pretty-some grafic glitches
No keypad dissapearing issues.Dialer is much more stable.
If interested,I can upload it
GLBenchmark 1.1 New GLBenchmark 1.0 High performance mobile benchmark for OpenGL ES 1.1 environment GLBenchmark Pro 1.1 Result DetailsGLBenchmark HD ES 1.1 no GPU Skinning :842 Frames
CPU Performance: Integer :7939
CPU Performance: Float :782
In engish words-its not bad,not bad at all !