Jumped up from about 290MHash/s to 305MHash/s with my 6870 using the new version..nice 5% extra

Going to try the backup pool option..but little bit nervous about that, since the functionality will be tested when the main pool is off and that time I may be somewhere out of PC.
Does anybody have any experience if it works? Up to now I've read just some "it doesn't work well" posts.