I have Stout Conicals as well as a MLT. The The Thermowells on the MLT are welded in while the one's on the Conicals are Tri Clamp type (TC). They are both great pieces of equipment. I have ordered a Brew Kettle and an HLT with HERMS both with TC Type Thermowells as an added cost.
I prefer the TC Type for 3 reasons:
1. Easier to clean.
2. Easier to Sanitize
3. Can be replaced with a probe.
If you order, you will need to get John to put on TC Type Thermowells if you want them. I would suggest that you do.