Just had a 3 day tour with CJ. 1 day Taroko, 1 day East Rift, 1 day East Coast.
CJ was a safe and excellent driver (none of us got carsick). Easygoing and super friendly with the kids ("babysat" them when they were napping and husband and I jogged on Baiyang trail!). Spoke excellent English. Quite flexible with the tour. Very prompt with whatsapp/email.
Everybody has a different preference, but we liked his style. He's not too chatty but not too silent.
His car is brand new (Toyota Wish) since he's new to the biz (started in December hence sparse reviews for him here). He's originally from Taipei but has lived in Hualien for the past 15 years and is clearly in lovely with Hualien.
When we arrived in Hualien, he took us to Fuxing street and preordered yummy scallion pancake. AND, even though our tour with him ended when he dropped us off at our Hualien minsu, he generously offered to take us to the station the next morning. Yes, he was picking up his next tour from the station at 10am and our train was at 9am. Still, it was extremely kind.
I know who I'll be calling if I come to Taiwan's east coast again!