Synthetic shares CFD are a simpler unleveraged variety of CFD's. They are derivatives, not a security, so their value depends on the value of the underlying instrument, i.e. the share price.
US Synthetic shares CFD benefits
Zero swaps - No costs are charged for leaving a position open overnight
Dividends - If you buy US Shares CFDs, you are eligible to get dividends
Reduced market risks - US Shares CFDs are not leveraged, so there is no risk of losing more than you spent to open a position
quick settlement of transactions - the D + 0 cycle ensures settlement of the investment on the same day