The Consumer Financial Protection Bureau's HELOC booklet, which Aven links on its disclosures page, says to consider a HELOC if you are confident you can keep up with payments, and that if you fall behind or cannot repay on schedule, you could lose your home. The same booklet notes several other points worth knowing:
Lenders generally may freeze or reduce a line if your home's value falls or your finances worsen.
If you sell your home, you generally must repay a HELOC in full.
Some plans end with a large balloon payment, and being unable to pay it could cost you your home.
Federal law gives you three days to cancel a HELOC after opening it.
These points come from the CFPB's general HELOC guidance. Your own agreement controls how they apply to an Aven account.
When a lower APR does not tell the whole story. A lower rate helps only if you can repay. The variable rate can climb to the 18% cap. A 2.5% cash-out fee adds cost at the start. Borrowing more than you can repay turns a cheap rate into an expensive risk. A lower rate on a balance you cannot clear is not a bargain.
When a conventional card may be the better choice. If you pay your card in full every month, an unsecured card may cost nothing in interest and puts no collateral behind your spending. If you tend to carry balances you struggle to clear, tying that debt to your home raises the stakes. See secured vs. unsecured credit cards for how collateral works in general.