Vaske brothers on our team last summer competed for the Licking County Settlers. One had great success while the didn't have as much but still was successful. The one who was the most successful was the pitcher who received votes for pitcher of the year made the all-star team and was all league first team.
Both of them enjoyed their experience, and learned a lot about themselves playing against majority D1 guys. There was no biasedness towards D1 vs D3 players if you look at Otterbein's C/UTL guy Wes Meadows he was also named 1st team, made the all-star team too.
So if they can compete against D1 guys more power to them.