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It says 'toilet exteriors', so as you say, you would be looking down at a coloured inside! Although to be honest, I would be happy replace the toilet, as I don't expect they are as expensive as baths.
And I know you can't believe everything you read either, I would much rather have the opinion of a user, rather than someone who is trying to sell you a product. My instincts tell me that this Tubby stuff won't work.
Ultimately, I guess the way to go is to change the whole suite, it is just that we are quite happy for it to stay, it is when we come to sell, I have been told that an avocado suite would put off prospective buyers.
It is difficult to know what to do for best. On the one hand, we want the place to be more saleable and know that we will have to shell out some cash, but on the other hand, we don't want to spend more than we have to.