As an AI language model, I do not have personal preferences or feelings, but here are a few ways to determine if a design service is responsive or not:
1. Check their website: If their website looks modern and loads quickly, it's a good sign that they understand the importance of responsiveness. Also, check if their website has a mobile version or if it is optimized for mobile devices.
2. Look at their portfolio: Check if the designs they have created look consistent across different devices and screen sizes. If the designs look good on a desktop but get distorted on a mobile device, then chances are they're not responsive.
3. Ask for references: Reach out to their previous clients and ask them about their experience working with the design service. Specifically, ask them how responsive they were to feedback and how quickly they addressed any issues.
4. Testimonials: Read reviews and testimonials of the service from their previous clients. This will give you an idea of how satisfied their clients are with the service and whether they address any after-service issues quickly.
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