I would like to make a product review for the Ajax Custom Filter and say one or two words about them.
I purchased the plugin because it has the capability to have both product's and specification's attribute included into my filter search. It made the search richer and broader. I was skeptical at first as my initial thought that the performance would degrade if they combined both from different entity. But it wasn't the case and I am really happy with the result.
But I would say what really impressed me is their support when I have queries. Pieter and his team responded fast and promptly and there's even one time, Pieter responded me as early as 7am his time, due to our timezone different.
I even had a request for a minor change, and I'm willing to pay for it, somehow they declined to charge because it's really too minor to justify.. hahaha, but they help me out and made the change for free.
To me, their attitude and professionalism made the different and why I truly like them and would like to recommend them, for the fact that they would go the extra mile to meet a client's need. They take responsibility on whatever shortcoming of their application, without any shift blaming, and made the changes accordingly.
Hope this would help you as you're evaluating their product as well.