Help please .

Does anyone have one of these lap frames , or have experience of them ?

I am considering investing in one of these , but I'm not sure if it is exactly what I'm looking for .
 I have a floor stand , but while it is great for taking the weight of a large frame ,I like easy access to the back of the work which is not always possible with a floor stand .
 I'm wondering if these type of frames are comfortable to use and if they allow easy access to the back of the work , without having to lift off the scroll frame all the time .
 Any help or advice would be greatly appreciated .
 Thanks ,
 Cath