Rebolt Bundle & Upsell

I used Unlimited Discounts and Bundles before, which is not bad, but Bundle Products from Thimatic is better.
1. Their support it better. I reached out to UDAB for support, and they responded right away, but each time they messed something else up.
2. It looks very clean, and straight forward to the customer
3. You can customize it very nicely (If you know what you are doing) and if not look at my first point.

The only downside is that their support is in a for US customers inconvenient timezone, meaning for me it's late or really early in the morning.