They are good budget components. It all just depends where you want to go. It's easy to better them by spending a little more but then that can be said just about anything at any price. As a one make system, especially at the discounted prices available, they are very good. But then the same can be said about a cheap NAD set up, even the entry level 315/515.
Thing is, just spending a little more can reap big rewards even if it means economising in another area short term. Example, £350 or so gets you a Creek amp, much better imo. Around the same price you find Marantzes 7001, again, superior to the 6002. Then there's the Rega Brio, a lovely fluid sounding amplifier sounding more expensive than it is. You could buy any of those within your £4-500 budget an partner it with a s/h player or a little NAD for £140 or so stretching your funds a little.
Then again, you could buy a vastly superior ex/dem cyrus8vs2 for £600 or so and partner that with some ebay s/h player til you can afford to upgrade.
Or you could buy AVI's ADM9, very capable active speakers with built in pre-amp/DAC/Power amps ...
have fun mate