I've no experience with them but that's not the way I'd go.
Looking at them they look like a fine product but one that for me would be very niche. They seem to be squarely in the class of product that is shooting clothing meets country casuals. There are loads of garments that fit the niche of fine in a bit of drizzle for a while, then back to the Land Rover, and certainly indoors by the end of the day. Barbour waxed jackets are a bit like that, great, but not what you'd pick to be on the hill in the rain in for a few days straight. There's a plethora of up-armoured synthetics around now that fit this niche, and with the specs of the Seetex being 5000/5000 I'd chuck those on the pile too as far as performance goes.
5000/5000 is neither very water resistant or breathable. In fact it is a very low score. Legally speaking they are allowed to market stuff with those figures as waterproof here. Personally, I think that should be a crime. The cheapest snowboard stuff you can get scores that, and it is never intended to be waterproof as in rainproof. There is a trend at the moment to set the benchmark at closer to 10000 with some of the newer materials on the market. The claim that often goes with that is you will hardly ever be out in rain that needs more, so settle here. I think that's a bunch of marketing tripe. I've still got wet in that sort of kit.
Mebe it is due to the differences in activities we get up to outdoors, but I'm personally dug right in to the 28000ish figure offered up by Gore-Tex if it is raining properly. Recently, I've been digging on eVent too at around the same kind of figures. Stuff that can handle
this is as good as it gets [regardless of which one edges it], and are exactly the kind of fabrics I want to be in if it could hammer down relentlessly while I'm off the beaten track.
That said, whilst I stand on that being as good as it gets, and always will be what I want, I completely concede that 20000 can be a very acceptable figure. That is good news because it opens up the option of Pertex Shield [at potentially only £30 than the Seetex]. Because of what I said above I've not tried it but the figures are impressive. If I was in winter doing a bunch of harder stuff I'd probably be living in 3 layer Gore. On the bike eVent. Yet in summer where I might not get to use a waterproof at all, but if I do need one I'm going to need a pretty good one, Pertex Sheild looks great. That level of waterproofness in a package that scrunches up small and weighs 125g/4.4oz [in medium] has considerable appeal to me. My size in a pair of Montane Minimus can't weigh more than about 6oz. That would free me to wear something a lot cooler when I wasn't in those than a jack-of-all trades country causal trouser. They must be warm and unhappy to be in with that 5000/5000 business in the height of summer if you use them outside of a quite narrow scope.
I'm sure we could find others too so I'm not rooting for the Minimus exclusively. They just make for a good illustration of the way I'd go a light trouser and decent packable over trouser in preference to a pair of low performance all-in-one jobbies.
Totally with neeman on gaiters.
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Get the best midge net you can find. You could be punished very severely if you plump for a good enough for fat mosquitos only net. Like throwing peas at chicken wire. I like the Lifesystems stuff.