I am running a 24" one with a Vertex ballast and I haven't had any issues.  I also have a friend running a 48" one with the original ballasts without issues.   
  
I have read that the bulbs aren't the greatest quality, but once they are changed you should be good to go.  The legs are really cheap, so a hanging kit is a good investment. 
		
	
		
		
		
		
		
	
		
		
	
	
	 |