I personally do not have a Dynasty Spa, but as it relates to electronics in the spa, I would suggest that you simply review how it is handled in the warranty of the spa.
The Hot Tub itself is one issue, but the electronics are supplied by a supplier. Who will service it IF service is needed? Electronics and Hot Tubs are viewed by some as take it or leave it. It really comes down to money and affordability.
How long have they been putting TV's or other electronics in their spas and what are the most common problems they (the dealer or manufacturer) have encountered with them.