There are 2 Lake Murray estates. I actually live in the one on the Chapin side. The one you are talking about I assume is the one on the Saluda side.
I think anything you buy on LM right now is a good investment no matter where it is. The only 2 drawbacks I see on the Saluda side are Schools and distance from town. For me the distance from town would actually be a positive because I hate cities...I like the country. If you don't plan on living there and sending your kids to school there the school issue is irreleveant except during resale.
I am not trying to bad mouth the Saluda school system at all but the Lake is surrounded by Chapin, Dutch Fork, & Lexington high schools which are some of the top schools in the state.
Also, if you are thinking about renting it out by the week I'm not sure about the rental market in the Saluda area. I would definitely research that a little.
the good thing about the Saluda area is you can still find some Lake homes that are reasonably priced...whatever that means . They are also continuing to increase in value like all the other areas of the lake are.
Good luck. Glad to see y'all are enjoying LM. I wish there was a little better weather for you and a weekend we could show you around the lake.