No one can really answer that question...its all about your comfort level. Personally, A 10yr/100k warranty for $150/yr seems like a good deal to me.
For reference, below are some quotes from a MA dealership thats nearby to me.
Vehicle: 2014 – 2018 Toyota Sienna with less than 36,000 miles.
Toyota Extra Care, Platinum coverage with $0 deductible:
6 yr / 75K - $685.00
6 yr / 100K - $985.00
6 yr / 125K - $1250.00
7 yr / 75K - $780.00
7 yr / 100K - $1140.00
7 yr / 125K - $1375.00
8 yr / 75K - $900.00
8 yr / 100K - $1255.00
8 yr / 125K - $1670.00
9 yr / 100K - $1435.00
9 yr / 125K - $1915.00
10 yr / 100K - $1545.00
10 yr / 125K - $2070.00
For reference, below are some quotes from a MA dealership thats nearby to me.
Vehicle: 2014 – 2018 Toyota Sienna with less than 36,000 miles.
Toyota Extra Care, Platinum coverage with $0 deductible:
6 yr / 75K - $685.00
6 yr / 100K - $985.00
6 yr / 125K - $1250.00
7 yr / 75K - $780.00
7 yr / 100K - $1140.00
7 yr / 125K - $1375.00
8 yr / 75K - $900.00
8 yr / 100K - $1255.00
8 yr / 125K - $1670.00
9 yr / 100K - $1435.00
9 yr / 125K - $1915.00
10 yr / 100K - $1545.00
10 yr / 125K - $2070.00