Even though I am not a fan of RVGs, it is the case that early BN CDs are usually of limited quality. I think your best guide is your ears (and of course your system is a factor). If you LIKE RVGs and if you think by comparison with RVGs you have that the existing versions sound bad, then of course, upgrade. If you are basically satisfied stay with what you have. it may be that you arn't satisfied but don't really want to have to upgrade. Well this is a choice too! If it isn't important enough to you, it is not a priority, full stop. These RVGs will be available for several years, I believe, so there may be no hurry.