I'm roasting beans today and have just finished my first batch. I'm experimenting with single origin blends combining a few different roasting profiles. These are the lightest roast I will do, the next batch will be a darker roast, with a half quantity of an even darker roast. In theory this will give a more complex flavour profile.
I am still quite new to roasting and I am trying out different things to see what I like. I generally do plunger coffee not espresso, and find I prefer lighter roasts in general. Small changes in how you roast can make big differences in the outcome though - I have been focussing on cooling the beans quickly after roasting which made a noticable improvement in flavour.
I have a Behmor 1600 plus. It works pretty well & the smoke supression is good because I can roast inside, but I think it would be improved if it got a bit hotter. I find I have to roast a fair bit longer than the pre-set roasting profiles allow on the larger batches.