I go back and forth between AutoCAD and SketchUp all the time with no problems.
Some suggestions:
The cleaner your AutoCAD file the better it will open in SketchUp.
I keep a AutoCAD file called To SketchUp that has essentially nothing in it (no blocks, no linetypes, meta data, etc.). I copy my geometry into that file then use Purge (extensively)and Overkill to get the file ready for SketchUp.
SketchUp doesn't have arcs or circles so any line that intersects a circle will give you trouble. On the SketchUp side open the Entity Info panel and increase the chord count of the arcs to give you smoother lines. On the AutoCAD side I always extend any lines that intersect arcs several inches beyond the arc so I can trim them back in SketchUp.
I hope something here helps.