Generic sildenafil can be just as good in practice if the product is legit and the active ingredient is actually what it says it is. That is the real issue, not whether the box says Pfizer or Kamagra. A lot of the difference people notice is consistency between suppliers, not magic in one brand. Since you are comparing it directly to Kamagra - vialora.net/read-nznvw2, I would judge by product details, packaging, batch info, and whether the seller looks like a proper pharmacy rather than a random reseller. If those basics are solid, generic sildenafil is not automatically worse.