Music App Blog have highly recommended iRig HD in their in-depth review: "Comparing the original unit with the new HD version, the differences are immediately obvious; the iRig HD gets a much cleaner and clearer sound into your iDevice and is much less prone to interference."
Music App Blog's John Walden, who is well known for his work with Sound on Sound magazine, has recently taken an in-depth look at iRig HD and he was seriously impressed! Here are some of his comments:
"Physically, the new iRig HD is slightly bigger than the original unit. However, it is still compact enough to fit easily in your pocket alongside your phone or tuck neatly into your kit bag alongside your iPad."
"As with the original iRig, using the new iRig HD is a breeze; you simply plug in your guitar, plug the iRig HD into your iDevice using the appropriate cable and fire up a suitable iOS guitar amp sim."
"Comparing the original unit with the new HD version, the differences are immediately obvious; the iRig HD gets a much cleaner and clearer sound into your iDevice and is much less prone to interference. The result is cleaner and, in particular, much less hiss and buzz on those overdriven sounds."
"IK Multimedia are one of the companies that has really embraced iOS as a music-making platform. They have a wide range of products in their catalogue that are pitched at iOS musicians and iOS guitar players in particular. The iRig HD is an excellent addition to that roster and if it doesn’t sell by the absolute bucket load then I’ll be very surprised."
and John's final conclusion is:
"Whether you are a newbie iOS guitarist or an old hand looking to upgrade from your original iRig, the iRig HD comes highly recommended."