About a year ago I received an ION TTUSB. It's a turntable that accepts 33's and 45's and has a USB output. I finally got around to using it last month to create some CDs for my mom from some old albums she has. My experience was good but the main problem I had along the way to a completely working system was configuring the audio properties on my computer. Initially, I was getting only mono recording. Here are the steps I took to get stereo.
First follow the directions to set up the turntable. This is mostly about attaching the belt and balancing the counterweight.
After plugging in the USB cable, you will see some notification bubbles about installing the hardware. When it is complete, you might need to change some of the audio properties. In the control panel, open "Sounds and Audio Devices". Click the "Audio" tab and inspect the "Default device" in the "Sound playback" section. If it says "USB Audio CODEC", change it to whatever other device you have that supports audio output.
If you have a microphone, click the "Voice" tab and inspect the "Default device" in the "Voice recording" section. Again, if it says "USB Audio CODEC", change it to whatever other device you have that supports your microphone.
If you're using Audacity, select "Preferences…" from the "Edit" menu. Inspect the devices and change the number of channels to 2 (Stereo). You might want to check the "Software Playthrough" check box so you can hear the music as it is recorded.
Something else I did since I have a small system drive and a large data drive is change the temporary directory to my data drive. I clicked the "Choose…" button and selected my "E:\tmp" directory. It automatically appended "audacity_temp".
Doing so will require restarting Audacity.
On ION's TTUSB page, you can download Audacity, the LAME MP3 encoder it requires if you want to create MP3 files, as well as the software and user guides.
One problem I experience is the occasional dropping of the input signal. If it gets too low, Audacity stops recording. I didn't see anything about it on the ION USB Turntables forum, but I think it's an Audacity bug. I looked at Windows Task Manager and I noticed multiple instances of Audacity running. My work-around for this problem is to stop all such instances using the "End Process" button in Windows Task Manager.
A problem some people listed on the forum was with clipping. There's a gain control on the bottom next to the cables. Turn it down to fix the problem.
Another problem was an entire lack of input. Downloading an audio driver fixed the problem for some.