100% correct. With the correct fit - and Shure 'phones come equipped with a range of different sized, interchangeable ear plugs - you'll have as much bottom end as you need, along with complete isolation from external noise. When I first started using the Shures I had a little bit of difficulty adapting to them and it took a while to get used to pushing them as far into my ears as they need to go. Now I wouldn't use anything else and even when listening to bass heavy music such as reggae, I've never needed to alter the EQ settings. Some things you do have to note about IEM's is that they need to be cleaned frequently due to possible wax build up - and there is a risk in very hot weather of getting moisture into to them if you're sweating.