Hi,
Enterprise Access Points especially from Aruba are definitely better then any consumer brand for numerous factors. Below are some of them to give some food to your thoughts and decisions
1) Consumer brands lack in providing reliability since they dont (and wont) offer any SLA guarantees. Enterprise brands such as Aruba provide reliable performance and they are responsible to provide it, if there is any issue, TAC will work you through to get it done. I dont expect we can get any such assurance from consumer vendors
2) Better User Density management.
My experience with some customer who use products like Unifi, always complain about user density and roaming issues. Consumer brands usually dont provide reliable air fairness algorithms to balance different clients holding different capabilities
3) Better Roaming, Sticking client problem
Sticky client problem is a norm for consumer grade. No matter what they claim they cant get rid of it. Aruba takes care of it
Also keep in mind that depending on the number of APs, you can easily startout with IAP-305 and make a cluster without needing extra on-premise or cloud controller( Note: Aruba doesnt provide cloud controller)
Regarding his statement about no access to firmware, please check, i think he may be trying to sell you pre-owned or grey market product.