While it's not a small one by any means, I have had a Safety-Kleen tank since 1978.
In that period of tme, I have had to replace the convoluted tube nozzle and the pump and as it turned out, I wouldn't have needed to replace the pump, just change the solvent more frequently-LOL.
Given the longevity, I can certainly vouch for the Safety-Kleen units, but they are hard to find to purchase outright. Mine was a gift from my mother for IIRC my 17th birthday. Both it and I are still going strong!