A disadvantage is that gives up the ability to sign off in 2D. Summarized here is one of the simplest transfer systems for those who play a 1NT opening of 15-17 pts. Stayman , asking for a 4-card major. You can use 2S to show any hand with both minors, but it's most valuable use is by either a very weak hand or a very strong, slam-invitational hand. With intermediate strength and both minors, you'll usually want to play 3NT, so asking about opener's minor-suit length won't be as helpful. After responder's 2S , the 1NT opener bids 3C or 3D if he has at least a 4-card suit.
Responder can then pass with the weak hand or bid on with a strong hand.
Invitational to 3NT, showing about 8-9 pts. Invitational to 3NT, showing 6-8 pts. If you're using Jacoby transfers, you won't need these bids to show a long suit. After partner bids your suit, choose a rebid that describes your hand further. Invitational to 4H or 3NT, exactly 5 cards in your suit.