The pump seems like it will be fine for the price. The chamber isn’t huge but will meet my needs. The instructions are terribly written and there is no actual instruction for the operating the vacuum, just garbled notes on the pump itself.
I use this to remove bubbles when making jewelry. I place dried flower pedals/pieces in the resin before I place it in the vacuum. Then all I have to do it pour into the mold. Haven’t tried it with whole flowers though. Not sure if it will mess them up as the bubbles rise.