Super Pro are a renowned brand so I'm sure those would be fine, and offer improved driving feel and performance over OEM, but I'd personally be wary of having them on a Lexus where the luxury aspect is such a significant factor.
I've no experience with those particular items, but one of my previous cars was poly-bushed and I wouldn't go down that road again. Typically, polyurethane "upgrade" bushes introduce more harshness, vibration etc into the ride quality. Plus, they may end up creaking or squeaking after a while and need to be lubricated again.
If mine ever need to be replaced, I'll be going for the TRD bushes.