In a word yes.
As a Silva Ultramind Instructor and Sila Method grad with 15 years of using the method
I recommend them.
Many beginners using Silva tend to stray and not know what to do at level This is particularly the case in emergency or stressful situations.
The Paraliminals start you off with your intention then uses the same nonconscious mind that you access while at level for problem solving when you apply Silva.
It adds to the variety and actually helps to get to level faster. Try thinking of a successful Paraliminal session when you do the countdown.
Alex