We visited in the middle of an extended drought and still there was plenty to see. (We were scouting examples of native / drought-resistant plants to use in our landscaping so this was actually a plus.) Plants and trees were clearly marked and there were checklists for birds, butterflies, etc. that had been seen there.
The whole visit took less than an hour including a walk down by the Guadalupe river and a visit to the gift shop. I wouldn't drive from as far as San Antonio just to see the Center but it was a relaxing road stop on our way to Ingram. If you are visiting the area it is worth the stop.
Some of the summer camps / classes offered by the Center sounded interesting too.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.