Being using Phillips trimmers for some years here a little on the newer models
There are/have been a number of models in the 7000 series.
I know of these
2013: BT7090 (Almost identical to the 2010 QT4090, with improved battery)
2016: BT7202 and BT7210
2018: BT7500 and BT7510 and BT7210
Unfortunately I cut my hear and beard shortly before I bought the BT7510, so will have to wait a few days to see if it is better, the short test-round feels like an identical cutting tool with improved vacuum, compared to the BT7202. 🙂
They last two generations are rather close to identical, and for good reasons as the BT7202 works really well. I have used it for 2½ year for both beard and and hair, and it is almost as new. The QT4090 I used 2½prior, was somewhat worn when upgraded. (Prior to that I had the 2007 QT4085 for 6 years – before that it was a mess without vacuum)
BT7202 vs BT7500 The latter got a better vacuum (claimed 50% better), and slightly approved grip for removing the cutting head, plus some cosmetics.
Find here the official UK compare
BT7500 vs BT7510 vs BT7520 The first has NiMH battery, the others LiIon battery, The 8510 adds a little extra accessories, and cosmetic details e.g. the cutting hight indicator is backlit through the cover. The 7520 is a variant of the 7510 with a little extra accessory and a different display. (They also got 7512, that is a 7510 with 7520 accessories)
Find here the official Danish(!) compare, BT7510 not on the UK site (and no changing da_DK to en_GB or en_DK in the URL does not work)
The backlight thing is actually not that clever, as you have to either change the height or turn he trimmer on to see the current height. Not a big deal, but not really thought through.
(Similar to 7500&7510 goes for the 7202 vs 7210. Had I known the existence of the later when I bought the former, I would have chosen the 7210 for the battery)
BT7090 vs BT7520 Here a LOT of things has changed, primarily improvements, though the cutting height range went from 1-18mm down to ½-10mm
Find here the German(!) compare, could not find that in English either, same story…
The cutting by the 7090 was fine, but the flap to the hair compartment was a bad solution, that is much more stable in the newer ones. Though it is a bit harder to clean the compartment, but unless you got a very greasy beard/hair, almost all hair comes out easily with a little shaking or tapping on say the edge a bin.
The cutting unit have a principle flaw that is rather easy to remedy (reversibly) with a thin piece of somewhat stiff plastic, but though I told them five years ago, it is still not fixed.
There is a gap between the moving knife and the housing of the cutting unit. And hair very easily gets into the head through this gab, so the unit needs to be cleaned often.
With the fix it can go for months, I do not even recall when I last cleaned the house internally…
Remove the a single screw
Slide the top part forward (you might need a small screwdriver to pry it open)
Disassembled it looks like this
And adding a thin piece of suitable cut plastic (Here I just took it from the old one…)
And assemble the unit.
As you can see, clicking to enlarge the next image, at the end of the arrows the plastic is touching the knives.
With this it is much harder for hair to get into the cutting unit.
(Yes I know the cut of the plastic is a bit sloppy, but it is not super important.)