以下是Smallman于1995年所写的一封信中对Kneipp吉他的评价，也提到了威廉斯大师对Kneipp吉他的评价。

自Smallman成名以来，澳洲有一些吉他制作家想方设法模仿他的吉他，并声称他们的吉他在某些方面超过了Smallman吉他。但是，Smallman本人认可的却仅有Kneipp和Philp。可惜Philp英年早逝，否则当今世界上有更多人可以使用上正宗的Smallman风格吉他了。

在此感谢网友Yanfeng先生提供这两篇文章。事实上，这类文章参考一下也罢了，最重要的是，经过众多演奏家和吉他爱好者的实际演奏评鉴，已经确立了Kneipp吉他在制作吉他制作史上的地位。

I thought you might be interested in this letter Greg Smallman wrote in 1995
about Ian Kneipp's guitars.

The letter from Greg Smallman reads: "Ian Kneipp builds classical guitars
using a lattice braced soundboard. His strutting position, dimensions and
soundboard thickness are the same as mine. I see all his guitars and
recommend small changes before finishing to the bridge and struts.

Only two guitar makers are under my supervision using exactly my system of
strutting. Ian Kneipp is one of them.

Ian Kneipp's guitars are relatively dark sounding, as are my own. This
gives the guitarist the opportunity to make music rather than noise as
produced by bright percussive guitars.

John Williams prefers the full sound of a dark guitar and has commented
favorably on the sound and good value of Ian's guitars.

还有一篇：

I own an Ian Kneipp guitar and I am very very pleased with it. It's an
incredibly loud guitar, a real canon in concert, but its tone is also gorgeous,
very mellow and somewhat dark, but the incredible overtones keep it brilliant
sounding. He uses the Greg Smallman design and I read that Greg Smallman has
approved/endorsed only Ian and one other maker (who i can't remember) as
luthiers who follow his design. Check him out for sure. I love my Kneipp. :)

我想你可能会对Greg Smallman于1995年写的一封关于Kneipp吉他的信感兴趣，这封信写道：Ian Kneipp采用网梁面板结构制作古典吉他。他的吉他的内部梁架位置、尺寸和面板的厚度都和我的一样。我看了他所有的吉他，通常只在完成之前建议他更改一些像弦桥、音梁等细微的地方。
（世界上）我只指导两名吉他制作家，他们完全采用我所创的音梁系统。Ian Kneipp是其中之一。
Ian Kneipp的吉他体现出和我的吉他一样的深沉浑厚（dark sounding)的声音。这就为吉他演奏家提供了机会，让他们弹奏出“悦耳的音乐”，而不是象那些声音高亢的带有打击色彩的吉他弹出的“噪音”

威廉斯喜欢吉他这种深沉浑厚的圆润声音并对Ian吉他音质和价值给予高度的评价。

.

还有一篇(这是国外吉他爱好者提供的信息）：

我拥有一把Kneipp吉他，我非常喜欢它。它的音量让你难以想象，音乐会上的“加农炮”！它的声音还非常华丽，非常淳厚并类似深沉的特质，令人难以置信的泛音使它的声音变得明亮。他采用Smallman的设计。我知道在采用Smallman结构的制作家中，Smallman只有认可Ian Kneipp和其他一位（我记不起来是谁了）。你可以向他查证一下。我爱我的Kneipp吉他。