Cough splutter .... none really .... wheeze ......
Well a bit. In the kitchen, under the cooker extractor with the window open, there is a blue haze, and some chaff (just a little) decorates the cooker hobs. I think the best place is close-ish to an open door or window. Not so close that the ambient temperature effects the roast, just near enough to extract the smoke and chaff. That said, it's a tiny amount of chaff (the collector works very well) and more haze than real smoke.
The IMEX works great for me. There have been loads of discussions about IMEX vs I-R and bed vs hot air roasting on TMC, and I have no experience of anything other than hot air, so others may be able to help you more. For me it was about having a back-up to Steve's roasts for days when the beans simply get used faster and I might run out. I considered a Gene Cafe but decided that was a whole seperate hobby financially as there was no real gain
for me over the extra it costs to get Steve to roast a better job than I could ever achieve. But I did want to dabble, and have some resilience too for shortages, so this was a good compromise.
I bought mine from JamesO, so it was excellent value too. How a new one at full price would hold up against an I-R at a little more is possibly something you might want to consider, though the IMEX seems great to me, and GeorgeW has been using his for ages with excellent results. Lots of others here have them too. SimonP has a modded version of the IMEX and a Hottop, so he might have some pointers, whilst Dom roasts with an I-R and is very happy.
Hope that helps