Some of the disadvantages of Point of Sale System are
1. Point of Sale system are Costly
2. Need Man power to handle POS system
3. Security Risks caused by POS Malware that breaches the point
of sale's customer debit and credit details which would put
business and customers into risk.
4. Liability
5. No service - You need some one to assist you when you have a
problem in POS system
6. Update Delays & App Store
7. Notion of low cost is a myth
8. Deficiency in compatible devices
9. Poor customer retention
But the disadvantages can be over come with the following
remedies
1. POS Security to slay the point of sale malware that infects
POS system
2. Opting Point of sale system that has 24/7 customer
support
Know more in detail at
securebox.comodo.com/pos-system/pos-security