laser -> "special" resin required. Formlabs recently moved on to LCDs meaning in the years to come the last third-party manufacturers will stop producing those resins as demand further declines. Leaving the first-party FormLabs as the only option ($100+/kg).
Difficult to maintain resin tank. Requires a vacuum oven and an upfront investment of roughly $150 for chemicals. There are conversion kits/prints for FEP film to resolve this limitation.