I haven't used a V600 so I can't say anything first-hand about its performance. That said, much depends on the size and quality of the media you are scanning and what you consider to be "good enough". So it's an impossible question to answer objectively. According to the Scandig review of that scanner (what I consider to be a reliable source of analytically useful information) (
https://www.filmscanner.info/en/EpsonPerfectionV600Photo.html), the scanner has an effective optical resolution a bit over 1500 PPi. The media you are scanning probably doesn't have perceptual resolution equivalent to more than 200~300 PPI, so from a resolution perspective, speaking purely in terms of the arithmetic, that scanner will give you more than enough resolution particularly if the dimensions of the scanned images are to be no more than say roughly three times the dimensions of the original media. But that doesn't mean the perceived sharpness will be to your liking. The resolution can be mathematically fine according to the USAF test Patrick used, but the perceived edge sharpness of micro-detail depends on the quality of the scanner's optical system to produce distinct edges, and the extent of magnification. In other words, the USAF test tolerates seeing separable line pairs that, while separated, can still be somewhat fuzzy.
The V800, more expensive, has a better optical system for slide scanning and all round higher usable resolution (around 2300 PPI), which you may not need for much of your work, but could come in handy for some, especially if you intend to do cropping and want to make enlargements considerably bigger than your media. It also has other technical features the V600 lacks - you can compare in the various reviews; for a large task like scanning a family archive productivity features of both the scanner and the software could be important in terms of time saving. If you buy an Epson V800, it comes bundled with SilverFast 8 (SE) which you can upgrade to Ai for a reasonable price. So you should compare the price of the V600 Plus SF8 Ai versus V800 with upgrading from SE to Ai. I'm not saying you need a V800 - the V600 may well suffice for you, but you should consider the option before buying. If you are buying a V600, it would be good to buy it from a source that will let you exchange it within a limited time period in case you aren't satisfied with it.