The school I went to had a couple tables with removable boob cups. All the ladies thought they were a joke and never used them. Mostly just got used as cup holders. General concensus from instructors was they were a solution to a non-existent problem / useless feature to justify raising the price.

I'd say your best bet is just check the reviews on softness. If you want extra comfyness is to get a table warmer like this one. Extra padding and a warm table :-)

Another option is to check your local Craigslist for used tables. That way you could get a feeling for the padding beforehand and get a nice sturdy table for the same cost as a cheap one.