No. The Redison Pro Latency Adaptor is optional. You can use Senspad without it.
If you want to play with a better latency (30% much faster), we recommend you to order it. You just have to upgrade your pledge by adding 40€ (or $45 USD)
If you want to get more than one Senspad, you just have to change your pledge by adding 130€ (or $140 USD) per pad. The shipping cost won't increase.
Don't see the answer to your question? Ask the project creator directly.