For several Labs in a row, Canon’s wonderful Pixma MP610 all-in-one has finished so far clear of the competition that we expected this review to be something of a formality. A few improvements, a bit of a polish, and more of the same high standard please, Canon.

What changes there are, however, seem minor: a couple of centimetres have been shaved from the depth, a further 12mm from the height, and just over a kilo from the weight, making it more of a streamlined beast than before.

The old flip-up control panel remains centre-front with its 2.5in colour display, scrollwheel and option buttons; a door for the memory card slots sits bottom-right, above the PictBridge port, while there are some nice little touches such as the output tray automatically flipping open if you start a job with it closed.

But if the outside looks familiar, it’s the internals that see the changes – unfortunately, not all for the better. As with the standalone iP4600, the old ink tanks have been replaced by the new range of 520 and 521 cartridges.

Capacities are down a little – for example, the pigment-based black will give a quoted 350 pages, compared with 505 from the old MP610 – yet prices are significantly higher: up from $12 to $15 each to around $20 for colour and $25 for black.

It would be a bizarre enough change without any other impact, but the print engine is actually slower than it was before. Draft print speed is down to 10.5ppm from 14.6ppm.

Standard text is 6.8ppm, down from 8.8ppm. And it took nearly twice as long to print five mono A4 copies as its predecessor.

It’s only in colour printing that it performed to our satisfaction, matching the MP610’s 4.5ppm A4 print rate, producing a 6 x 4in photo at best quality in 45 seconds, and beating it at colour copying.

To be fair to Canon, the MP630’s print quality is almost identical to our old MP610 test results, with just a slightly paler red from the new device to distinguish the two.

Thus, text is perfectly thick and well-defined, colours are generally accurate with no bleed and excellent gradients.

The scanner also appears slightly improved, with more defined edges and, to our eyes, more detail, which transfers to slightly better-quality copies.

While much of the above may sound like a damning indictment of the MP630, when viewed next to the rest of the competition it’s still a superb printer.

It’s quicker and produces better-quality results than any other affordable all-in-one, and it undoubtedly deserves its recommendation. If its predecessor hadn’t existed, we’d be raving about it.

But we can’t escape the nagging feeling that Canon has sabotaged its own bestseller for a higher profit margin on the consumables, and for that reason we’d urge potential buyers to look for the last few remaining MP610s.

Only once that avenue has been exhausted should the MP630 be considered – hands down – the best all-in-one on the market.