Having recently bought an Aero (returning to dinghy racing after a 5 years break sailing a bigger boat) and now sailed on a large gravel pit in 6 races from zero wind through to what for me was survival conditions. I'll offer the following and probably also risk being flamed or banned from the site, for some of what will follow.
It is for me great fun to sail but it is a challenge when the wind gets up as proved I think my the many discussions on this forum about how to recover from a capsize and get back in the boat. (something I have yet to experience!).
IMHO it is much more sensitive than a laser to sail especially to tiller and weigh movement. But due to the centre mail sheeting is in a way easier to tack and gybe and the main sheet does not get caught on the back corners. The tiller extension is longer so you need a good tacking/gybing technique otherwise it gets in the way. I think when you get used to the lightness of the boat which makes it sort of twitchy when you over steer (which I was doing to start with) it will be easier to sail in a blow than a laser as its easier to depower with the downhaul/outhaul.
Like most dinghies, most folk can sail it in suitable lighter winds, but how suitable it is for you as a beginner when the wind gets up depends on how good your tacking and gybing technique is, how agile and fit you are and how quickly you will learn. If you end up going swimming to often and get dispirited you will probably quickly hate the Aero, and that will no be good for you or RS or your club to just have another unused boat sitting there.
Most of the folk at our club who like the Aero are no taller than 5ft 8in. One who is about 6ft (and a sailor of the same ability as I am) hates it and think its the worst boat ever made - well that's whet he said in the changing room last Sunday!)
If your are a real beginner and your club has lasers you can use I would suggest sailing them for a while and improving your balance, tacking and gybing. RS have demo boats so I would definitely make sure you sail one before buying, if possible in a range of wind conditions. I think RS also take boats to clubs for demo days at times. I guess if they read this they may post a link to more info about demos.
To put the above in context I'm 55 (70kg 5ft6in) and have always sailed and have experienced a fair few different dinghies over the last 20 years but only ever owned and raced a Laser (for 5 years) and then Enterprises (for 16 years) before buying the Aero. I was/am an advanced dinghy instructor so my technique is ok (which helps compensate for my creaky joins and lack of fitness), but I have had to resort to letting go of the main sheet a few times in stronger winds as I lost control, and so very nearly gone swimming quiet a few times. BUT every time I sail the boat my boat handling improves and I know with practice I will be able to sail with the 7 rig in up to 20/25mph winds.
Hope the above helps and whatever boat you end up sailing you enjoy it.
Neil