Kettler Servo 800 is great for beginers and more advanced users. Works smoothly, very good resistance, very quiet! Previous bike I had had 6kg flywheel, kettler has 9kg - it makes big difference!!!
Really strong saddle so it wont break after a week or two; also good saddle adjustment. Bike was delivered two days after I placed the order. It is mains powered so you need to think where to put it in your house. Its not that big though.
If you know you're going to use it several times a week its worth its price, especially that quality is really good. I am very happy that I purchased this machine though at first I was discouraged by its high price (decided to buy kettler because cheaper reebok bike which i bought several weeks earlier broke very quickly and wasnt even half as good).