Flexible Holding Tank recommendations?

[SVAndante9]

Original holding tank failed and we're looking at flexible tanks:

Vetus
Vetus Flexible Waste Water Holding Tank - 18.5 Gallons

Nauta
Nauta Flexible Waste Holding Tanks at AhoyCaptain.com

Nauta's literature is more convincing than Vetus's but I'd like to hear some real world experiences.

I've searched Practical Sailor and this forum and haven't found much.

We'd love to have a rigid tank but short of ripping out a lot of in-place structure or giving up some much needed storage, there's no way.

Thanks,
Alison

[Bohemian17]

I just changed out my 24 year old nautus for a new larger nautus. Nice tanks and I would not worry about their integrity.